I'll bet if you pinned him down he'd go with CTRL-ALT-DEL on the whole thing. Social security, disability, medicare, medicaid, all of it. I think his basic model is to accord everyone the rights of senior citizens. I think the DNC is hoping against hope that the AOC wing of the Democratic Party gets annihilated in November so they can go back to Republican Lite. They may have to reassess when it is revealed that Nancy Pelosi and Chuck Schumer are only appealing when grading on a curve.
He said as much in an interview with Dave Rubin who has a conservative audience but other times he's been evasive or contradicted that interview. As a single person I might be able to make it on $12k a year but also my roommate is on disability, food stamps and supplemental housing and dude ain't exactly making it so maybe I couldn't. Add a few kids and you're SOL
Again, the idea is to "might be able to make it" such that if you can pull in $75 a week on Taskrabbit that's an extra $300 a month. Meanwhile it didn't take you 40 hours a week to pull down $1500. Add in a few kids and you add in a few $1200 checks. Take it from me - my little bundle of joy is hella more than $1200 a month. But a single mom with three kids is going to do better by society at $4800 a month, let alone the kids.
He's not even consistent on who gets the payment. I'm not super into arguing for things I basically support by way of political feasibility so I'm not going down that route. I support Yang insofar as he brings some interesting ideas to the fore but dude is just not anywhere near me on the political spectrum