To make my point stronger: I would call it a book ban, if English language books were illegal to write in the Latin alphabet, and only allowed in the Cyrillic alphabet. This would be consistent with the situation of Lithuanian language book ban (except it would not replace kindergarten and lower grades with Russian grammar schools).
Calling it a lie seems at the very least ignorant of the actual situation, or worse, willful twisting of history. If the former, I invite you to read https://en.wikipedia.org/wiki/Lithuanian_book_smugglers to find out on which day they are celebrated!
'Banning all books on Lithuanian language' and 'banning books in Lithuanian language written in Latin alphabet and encouraging transition to books in Lithuanian language written in Cyrillic alphabet' are different things.
Former would have had a goal of discontinuing written Lithuanian language and the latter had a goal of switching Lithuanian language from Latin to Cyrillic alphabet.
Misrepresenting the latter as the former is a lie.