I'm sorry but Zuckerberg has behaved in a consistently appalling manner for 20 years. He describes people who trust him with personal info as "stupid fucks".
Why should anyone trust him now, just based on some vague non-committal PR public interview?
He collects data on people who don't even use his products at all. It's impossible to browse the internet without handing data over to him. Why?
There is no reason at all to believe what he says.