Exactly. Just because someone claims their account was hacked doesnt mean its true. That tjtonmoy character looks particularly suspicious. He has a history of lying and cheating in contests and bounties. I do not believe in his story.
Although, you're right with your doubts but the story he shared seems a little bit informative at least for the ones who use same password on many platforms. It's always better to use different passwords for different platforms and one should avoid using same password or similar passwords on different platforms. I'm not saying that whatever the guy claimed might be correct exactly but it's a matter of concern and that's why I believe others should learn from it.
In 3rd case I also found something strange and I believe that someone else might have used his account to place that loan request as in the 1st case, but in 3rd case the user's account wasn't compromised at all, and I believe someone around him might knows his computer's password and that person might have asked for a loan instead of the real owner of the account.