Could be a setup.
It seems like that and this is what I think too. spiker777 has posted this address (I doubt, he edited actually) on March 18, 2017 but the address has been used on 01/01/2018 for the first time and after few days, on 11th January 2018, spiker777 have added both of his posts. I would say all these are a set up.
On the other hand... that's still weird. Why would he do that? So that it's accidentally discovered three years later? But the posts are obviously edited, so it's not proof of anything. It's almost like he was trying to scrub all application posts (it's not only those two posts, there are a few more, all edited) to remove some other address. Would be interesting to dig up some archives and find if it was really the address that was edited, and what the original address was.
And why replace it with an address of another user? So a couple more possibilities:
- Parodium acquired spiker777 account around that time.
- spiker777 acquired Parodium account around that time.