Can you post your Bitcoin address?
I can also say I bought Bitcoin when the price was $1 and hold it until now, I bought Bitcoin when the price was $3K during Covid-19 and sold at $69K etc.
Op does not have to post their BTC address if they don't want to, it is bad for privacy, especially when the address holds a large amount of coins in it. I understand you feel that the story is made up, and you may be correct, i have also called out a lot of members for posting fake and made up stories of how they bough x amount of BTC and made y profits, but they don't have to lose their privacy to prove their story, that is if there is a 1% chance that the story is true.
Regardless if this story is made up or not, still OP is not obliged to post his BTC address just for authenticity. Note that we all encouraged everyone most particularly newbies to protect our privacy especially when it concerns our bitcoin storage. But here we are trying to break that rule.
Now, even myself I can't tell exactly if OP is telling the truth or not. But if he's actually lying, I guess he won't benefit from it either. If this post is only for merit phishing, then OP lacks some factors to make his post meritable.