Unsurprisingly, the outage hasn't affected twitters own client. Roll on May 2023. Unless twitter want to block the EU, they will have to provide the same level of access to 3rd party clients as they do their own. If the API is down for 3rd parties, but not for twitters own client, that will be considered a breach.
Speaking of which, I wonder if the DMA would finally let us get decent RSS bridges for Instagram and Facebook. At least we already have that for Twitter.
Would this work to get the EU to say they've fulfilled the DMA's terms? No idea. But Facebook has yachtloads of cash to throw at legal battles, especially where it sees a potential existential threat.