Personally, I love proofs like these. If you don't really get it, Lottie and Gemma are friends (Harry and Louis' sisters) and there is a theory that whenever there's a family holiday at the Tomlinsons' or whenever Larry is in London or whatever, the fams get together (makes sense). I'm not following Lottie on IG, but I do follow her on snapchat. She is frequently active on social, and recently, as of christmas 2017, it was almost entirely confirmed that H and L both were in London, and when Lottie had posted videos on snap, they were all muted.
She'd have to mute them bc people would literally lose their heads if harry and Louis were seen or heard together in the same snap. Also bc their contract isn't entirely ended and they wouldn't be allowed to come out, it would start something huge.
(More Larry Christmas stuff to come)