We all know there's no difference between them (specially if you live outside the US), but I'm actually impressed how little the Biden campaign is doing. All they really got is "Trump bad", some bs about inflation being under control (if you exclude rent and food) and "protecting LGBT rights" (which I might have missed but Biden did literally nothing about?).
They should want to win to have their party implement the oligarchic plans and get that sweet sweet lobbying money right? Or are the elites actually preferring Trump right now?
The end result is basically the same as you said, but for their future strategy it probably makes more sense to have Trump win. It gives them a super easy "Look, everything is bad because Trump was in office, therefore you must vote for us" campaign next time. Lets them run literally any candidate under the sun and probably have even odds at winning. Which means they can safely shift further to the right than they usually do.
Arguably it still doesn't matter, because any candidate that isn't pre-annointed would stand no chance of winning anyway, but it definitely makes for a super easy campaign message. Their response to any challenge can just be "Trump spooky. WOOOOOOO".