Of course it is the simplest explanation.
There is no conspiracy here.
Filming Biden in a green screen from multiple angles, hundreds of photographs, a dozen reporters and crew and using CGI to place in a background making it all mach is a much more reasonable assumption than... he just talked to some reporters.
You seriously think THAT is the most reasonable, simplest explanation to a video of someone standing outside talking to people. Why would they even bother?
The conspiracy you are claiming is that dozens of CGI experts, producers, reporters, government officials, travel agents, the secret service, bystanders, witnesses and whoever is paying for it all being in on it.
Just a simple little conspiracy, sure.

As for lying... you do know Fox News went to court, and won the right to outfight lie to their viewers and order their hosts to knowingly lie as well?