Sounds scary to go "all in" like that, and we've met those kinds of folks over the years.. (Elwar did something like that in 2016). I could not see the exact date of the post, yet 11 years ago would be right before the second half of the 2013 price run..
So maybe $100-ish per BTC-ish? which would be 500 BTC.. and even if the guy was able to hang onto half of his stash, he would still have 250 BTC.. but from my impression, the way he was framing the whole "going all in" matter, I get he sense that he might be a bit of a weak hand, unless he was able to grow out of that, so then I wonder if he would have been able to mostly hang onto even half of his stash over various trying times over the years.. .. and yeah, by now, he would not even have to hang onto half since even 50-100 BTC would still put him in a decently good position, in the event that he might have had been able to hang onto even 1/5th or more of what he might have had been able to purchase with his $50k in mid-ish 2013.... so who knows how it all played out for the guy?
I personally made my first BTC purchase late 2013 around $1,200.. so that guy would have had gotten in before me.. but did he make it through the waves would still be a mystery.... and not easy to judge from just one post like that... even though we can speculate about the various ways it might have had worked out for a guy in such a situation.
