Turns out it was a group of local Overseas Chinese (sinopsis.cz/prazska-lennon…) that took down the HK Lennon walls off the Prague Lennon Wall and then repainted anything related to #antiELABhk . Graphic designer Liao who authored the 70 with wrong PRC flag comments:
Chinese tourist and 华侨 immediately started pictures with the Chinese posts.
archive.fo/M7KSX
archive.fo/IHzaa
One can only wonder what would've happened if the movement in 1989 as e. g. @tingdc remembers it (sinopsis.cz/en/beyond-beij…) succeeded like it did here in the Czech Republic.