You get loads of weirdos on twitter who's @name is dedicated to a player. Usually it's Man U/Chelsea/Arsenal fans but every club has them.
I don't think so looking at this though, they are pretending to be Jake Forster-Caskey.
EDIT - I think you are right. He was tweeting about Charlton in 2016 before we signed JFC. Just seems to be appear he is called Jake and decided to dedicate his twitter to his namesake like you said.
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I thought you were all for not letting a few rogue followers speak for, or represent, the majority?!