My question is, do you still have access to your Bitcoin? 7 years is a long time and a lot of previous exchanges have closed down, so it's pointless if you invest in Bitcoin but you don't have access to it anymore.
Op's story isn't true, but to answer your question separately, exchanges are supposed to be used for buying and selling BTC and not for storing them, either for 7 years or even shorter, i would never be comfortable if i had any of my funds in an exchange, your coins should be in your self custody wallet, so if exchanges bite the dust you are unaffected because your have the keys to your money.
So thinking logically, I agree with your opinion, because apparently the OP is a great example of a spammer who is trying to climb in the ranking so that in the future he will receive Bitcoins for his meaningless posts.
That's it, but they don't have to go through this way, instead of lying about holding BTC for X or Y number of years, they should just invest time to learn about BTC and things related to cryptocurrencies, and ranking up won't be hard anymore.