This isn't really "non discrimination", this is a vague non binding statement. The FAQ doesn't even says what happens when that "commitment" is broken. Just that you have to accept it. So the title here is misleading.
Seems pretty clear: You can't discriminate, if you do we terminate your account at our discretion.
Edit: I read the question only in the narrow sense of "what if you refuse to accept the new policy" v.s. "what if you break the policy once you accept it?".
The answer to the latter seems to be:
1. You have to agree to Airbnb's TOS to use their site: https://www.airbnb.com/terms
2. Section 24.C ("Termination for breach, suspension and other measures") refers to section 14 ("User Conduct") which says you can't violate the "Policies and Community Guidelines" which links to https://www.airbnb.com/help/topic/250/terms---policies
3. That links to their nondiscrimination policy (https://www.airbnb.com/help/topic/533/nondiscrimination), which seems to be the longer legalese version of what the linked blogpost is a tl;dr of.
What's clear is that if you press "no" on the popup, they'll terminate your account.
What will happen if you press "yes" and then continue to discriminate however you like? My guess: not much.
It doesn't explain what happens if one accepts the commitment and still discriminates.
> Seems pretty clear: You can't discriminate, if you do we terminate your account at our discretion.
That's not what the text says. The text basically says :
"If you don't answer Yes to the commitment, we will terminates your account".
It doesn't say
"if you actually do discriminate we will terminates your account"
Seems pretty clear what that FAQ doesn't say. It says nothing about what Airbnb will do if an host or guest discriminates.