Can we get a positive answer from Apple that the company doest not slow down the CPU for older MacBook Pros? We just need a truthful answer from Apple when we

Can we get a positive answer from Apple that the company doest not slow down the CPU for older MacBook Pros? We just need a truthful answer from Apple when we do not have any evidence for that, or it's hard to get an evidence. I had the older MacBook Pros (mid 2012 and 2013) and they are getting slower than years ago. So we need to make sure Apple is not doing the slow down like it does to old iPhones.