My understanding is that this is just another provider being added to their existing tip jar [0] feature. They essentially let twitter users link out to their third party cash app, paypal, venmo, etc accounts, and people can use those third party services.
This is really no different - they are linking out to Strike, a custodial lightning wallet.
[0] https://blog.twitter.com/en_us/topics/product/2021/introduci...