Maybe? But I am not that cynical. I think the answer is actually both easier and more complicated. The US’ public position has always (or at least for a long time) been support for a two state solution. And I don’t think the Democrats are capable enough of convincingly lying for this to be untrue. Someone would have leaked something etc. Plus it plays into their compromise fetish. And to satisfy that it helps to actually have some land for the second state left. That’s the easy part.
The complicated part is in understanding why they keep sending weapons. I think Dems have genuinely convinced themself that if they didn’t arm Israel, Hamas would wipe them out. And for a two state solution it helps to keep the first state around. So they keep sending weapons but they also want everybody to know that they are really disappointed whenever Israel uses them to kill civilians. Plus Biden thinks he can push Netanjahu more effectively if he stays on his good side. That’s the “hug Bibi” strategy. I think we have more than enough evidence that the strategy doesn’t work.
Also there is a difference between “enough weapons to level Gaza” and “enough weapons to secure the border”. And maybe someone should tell the people in charge of weapon shipments.