The account is 8 years old, and doesn't look hacked (he still posts in Spanish)
I don’t think you can conclude it is not hacked. The account has made a single post in the past year and the post was two words.
-snip
that may be true but it is the safest assumption at least based on hist 4 pages of post-history and him suddenly posting doesn't really raise any suspicion of being hacked.
What are you talking about?
Someone making a single two-word post, 12 months after making their last post is not an indication their account is not hacked. (notice the double negative).