If I can just intrude here with an important point...Yes, that would be in fact how informal logic -- in this case the almighty hypothetical syllogism -- works. If those saying the Ukrainian government is unable to handle the logistic burden of Abrams tanks are internet armchair generals, and spokespeople for the White House and DoD said as much, then they must be internet armchair generals.
This makes the assumption that spokespeople for the White House and DoD were telling the absolute, God's honest truth. I have noticed that you do not generally put a great deal of faith in their honesty, so there's no particular reason you should do so now. I don't trust them to be completely transparent either. And indeed, there's a fair chance they said it because it was a convenient thing to say to cover up their real reason.
Of course, if the USA and EU want, they can not just give Ukraine Western tanks, but also additional logisitcal capability to help use Western tanks.