He could easily have avoided all this by moving the topic to Archival, but he choose to throw his garbage topics on the board you moderate. This sets a precedent for using the board you moderate as a trashcan and by reporting his own posts there turns you into his personal trashman.
I think the explanation is this: he understood that hiding evidence in Archival board is not enough; he understood that chances to have his plagiarized shit-topics deleted are greater if he deletes their content and move them to an active board, compared with leaving them in Archival board, which has no dedicated mod. Then he chose Russian board, for the nepotism between he and the mod (explained above).
Prolly if he moved his shit in other boards he could get banned, so why take the risk since Xal0lex was there, eager to help
and also with his hands tied when a ban comes in discussion?