Claim: Products labeled with Proposition 65 warnings contain chemicals at levels that pose a significant risk of cancer or reproductive harm, based on current scientific understanding.

Prop 65 does not indicate "significant" risk, only that the product contains a chemical known to cause cancer.  Increased exposure levels and longer duration would likely increase probability of adverse outcomes.  

Interestingly, the following foods contain chemicals that are on the list:

GPT for the following

Certain foods contain chemicals that are on the Proposition 65 list because they can cause cancer and/or birth defects or other reproductive harm 1. The following is a list of some of the foods that may contain chemicals on the Proposition 65 list:

Popped chips and popcorn
Crackers
Nuts
Tortilla chips and tostadas
Sesame sticks
Wafer cookies
Dinner rolls
Protein chips
Cauliflower pizza crust
Phyllo dough
Keto bread
Trail mix
Almond products
Plantain chips

The Proposition 65-listed chemicals commonly found in such foods are:

Acrylamide: formed mostly on the surface of plant-based foods when they are browned during frying, roasting, grilling, or baking. In general, the browner the surface, the higher the level of acrylamide. Acrylamide levels can vary among different kinds of foods and even among different brands of the same kind of food. Many foods have low levels of acrylamide that do not pose a significant cancer risk and do not require a warning. A warning for acrylamide on a food product suggests that regular consumption of the food over time can pose a greater cancer risk than consumption of foods with lower acrylamide levels 12.
Arsenic (Inorganic): a naturally occurring chemical element in the Earth’s crust. Some plant crops, such as rice, can absorb arsenic. When rice is grown in soil with elevated arsenic levels, the amount of arsenic in the rice can be elevated. Some herbal medicines from India and China may contain arsenic. Some edible seaweed (especially hijiki, a short, black, noodle-like seaweed) can absorb arsenic from water 12.
Bisphenol A (BPA): used in some coatings for cans, jar lids, and bottle caps. BPA is also used in some polycarbonate plastic bottles and other food contact items. However, the use of BPA in these items is decreasing. BPA can leach into food or beverages from BPA-based linings in metal food and drink cans, jar lids, and bottle caps 12.
Cadmium: a metal found in certain fish, shellfish, and organ meats. Some leafy vegetables, like spinach grown in cadmium-rich soils, take up cadmium 12.
Di (2-ethylhexyl)phthalate (DEHP): a type of phthalate added to many plastics to make them flexible, and can be gradually released into certain foods and beverages from plastic food packaging 12.
Lead: a metal found in some dietary supplements, certain balsamic vinegars, some imported spices such as turmeric. In the past, some imported candies such as some products containing chili and tamarind, have had significant amounts of lead 12.
Mercury: a metal that can accumulate in certain types of fish and seafood. Fish that tend to have the highest levels of mercury include: king mackerel, shark, tilefish (from the Gulf of Mexico), swordfish, marlin, bigeye tuna, bluefin tuna, and orange roughy 12.

Please note that this is not an exhaustive list and that many other foods may contain chemicals on the Proposition 65 list. However, it is important to remember that the presence of a chemical on the Proposition 65 list does not necessarily mean that the food is unsafe to eat. The levels of these chemicals in food are generally very low and do not pose a significant risk to human health 1.
I hope this helps! Let me know if you have any other questions.