Zuck is on a major PR campaign drive, I would not trust a word he says.
He also said that he doesn't visit Russia anymore, yet a recent FSB leak indicates that he was frequenting there. And before that he heavily marketed Telegram as ad-free forever. And before that there were quite weird populist PR tactics when professional cryptographers pointed out Telegram's crypto is a mess.
YMMV, but I wouldn't trust a single word from this guy.
There also was a story when he claimed that Telegram is developed abroad but it turned out that many of Telegram employees actually worked at the same beautiful historical office building where Vkontakte was located at that time.
Also, a fun fact, when he was a CEO of Vkontakte, one day he was throwing banknotes into the crowd from a window in that notable historical building. Maybe he was conducting an experiment with universal basic income, who knows.