Oh yeah, and the fuzzy covers make them look out of focus, which we interpret to mean closer to the camera.
Why wouldn't the friendly press cooperate with a setup like that so Biden can have a couple tries to get it right?
Works either way.
I'm not saying they wouldn't cooperate with that if he asked for it, but if the intent was to give him a few tries to get it right then why not just do it for real and give him another shot if he needs it? Why make him pull the act in front of a greenscreen instead of stepping outside and doing the exact same thing?
Also, if they were faking a carefully curated walk past reporters using green screens then they'd have made it look better, and done a better job with his responses.