It would be a strange thing to tweet, if he's planning on going to Bayern. No need at all, to use the English flag like that.
If it was a player we were desperate to sign & he did the equivalent, there would be a meltdown & mass suicides, Txiki death threats on here.
It's not Leroy posting it. His social media presence screams "managed by PR company".
99% of the photographs on his Instagram are from club photographers/professional photoshoots and his tweets come 1 after each game with a photo from the game and always with the #InSane and #LS19 hashtags.
It will be a tweet written by a social media person at his PR agency and so it's not really worth reading into either way.