Well you are partially right. Democrats could have run a glass of water against Trump and he still would have lost. That's not TDS, that just looking at the nation without the MAGA Lies being told by right wing media.
TDS is the unwavering belief by MAGA Cult members that Donald Trump was in any way a competent President, much less a good one. The guy is the worst businessman in American history.
Every Trump business deal ends with the investors suing him to terminate the contract, and Trump refusing to leave. He loses every breach of contract suit, and then he appeals until the appeals run out, and then the Sheriff has to lock him out. Later, the investors cheer and drink champagne as the Trump name is taken off the building.