I guess many of you curious to know how it happened, or how stupid I am, so here it is. Scammers on FB marketplace are typically new account, without much infomation in the profile, give address in a remote place and push for delivery instead of collecting at home. This guy doesn't raise any of these red flags, the FB account is since 2016, and he encouraged me to come and collect the goods. Only when I say I couldn't come then he told me he can send by post.
All in all, my theory is that people would not scam knowing that the bank account - phone number - Twint number are all linked to their ID. But I was wrong this time I guess...