He said, "lastly I didn't buy this account. I was experimenting with crypto back then, looking what others were doing. Away time was due to some rough time at my former job."
Link: https://bitcointalksearch.org/topic/m.8507913
IF you believe what he says, that he did not buy the account, then that leaves only 2 possibilities:
1) He is also ShameOnYou and HarryT1923
or
2) He ran up the posts on all three accounts (Essex343, ShameOnYou, HarryT1923) and sold ShameOnYou and HarryT1923, but kept the Essex343 account.
The similarities are too close, there are no other possibilities.
+1, the first one is more possible