How about just stating what you think is wrong about the post rather than trying to be subtle and hinting at something nefarious while pointing out basic facts.
"Last year Abe said he was 15 years old, now he claims to be 16! Which is it Abe? Better keep your stories straight."
I think the thing is that if it's really the same review then the poster is effectively claiming that Freelancer.com closed his account and stole from him twice.
Why?
Well, he said so two years ago, after working with them for 5.
Then what? He opened a new account or got his old one resurrected? We have no idea.
What we do know is that now, 2 years later, he's posting the same story on Trustpilot but now claiming 7 years of working for them.
I'm not saying my interpretation is right but you have to admit that this does seem a bit fishy.
And what of that? I struggled to find work in software development in spite of claims of worker shortages. It's only due to my being stubborn and having a decent safety net that I could shrug off participating on freelancing sites. Not everyone can hold out for a better offer.