Very much likely
But why blame him only
There are many posts in various threads where many members are faking everyday about their trades EOD, though they never post in real time (or even if they post it real time, it is of very vague in nature/meaning). And the interesting fact is that some members do it on a regular basis and no one asks for the proof, like image of contract notes or of tradebook or of orderbook, etc etc. Perhaps every one knows that the concerned trader is faking.
Even a newbie like me can fake at the end of the day, that I earned 5k, 10K or post a chart EOD, marking my trades that I bought here, sold there and so on so forth. No intelligence is required in posting trades EOD, or chart EOD.
What I think, it should be made mandatory to post proof of ones trades, by the evening, if a member posts (read boasts) about his trades or earnings, by themselves or if someone asks for the proof (to start with).