Becoming an "Authorized IRS e-file Provider" is a significant hurdle that is not necessary to producing a real, mailable, tax return.

It's certainly a convenience, and most serious software would try to include it, but I don't think MSCHF are going for convenience. The Yahoo headline and article uses the word "file" but the video doesn't.

If they actually got this certified, it would be the ultimate troll!

Thank you, you're the only one who's provided a reasonable answer instead of "it's a joke"

this service is a joke

It’s a conceit, not a joke. It’s serious satire.