Buddy, no negativity, it's okay if I wrote something incorrectly, then being the real owner of the account, you will be able to prove ownership.
How is he going to prove it if there is no staked address from the first period, the period in which he only wrote in Spanish?
He can prove that he is the owner of the second period, the period in which he started speaking only in English, and that the post he wrote in Russian is due to the fact that he speaks several languages with a B2 (which nowadays is not even necessary for writing, as advanced as automatic translators are).
For me the crux of the matter lies in this, no matter how many languages he supposedly masters:
Please enlighten us, why would someone who has spent two and a half years writing only in Spanish, switch to writing only in English?