Prior to the official announcement that Joe Manganiello would take on the role of Slade Wilson a.k.a Deathstroke in the solo Batman movie, we saw similar activity on his own personal Twitter account.
History could definitely be repeating itself here; we will just have to wait and see.
By itself this doesn’t seem like a very interesting development.
However, given trends we have previously noticed from other actors who have joined the DCEU, it seems like possible confirmation that John Cleese could at the very least be in talks to sign on for a future DC movie.