The NVA didn't win the battles of the Tet offensive but their ability to prove mettlesome and disprove US narratives actually contributed to the growing anti-war movement in the US.
The Ukrainians ability to continue to stick their fingers in the eyes of the Russians and strong online presence is also key morale element to their war.
what goober is going to change their mind about supporting Trump to the bitter end? Maybe nobody in that category. But, if the will of American allies is taunted by these sorts of propaganda and they see more of their people laughing at Americans its all to the Iranian's good.