Firstly, you should consider the sheer absurdity of complaining about lying whilst having spent four years defending the most serially dishonest president in US history.Or it's not inappropriate at all, because I can disagree with an action while defending the motivation behind the action. The argument wasn't "was his action the best option", but rather "did he pretend the pandemic wasn't serious for bad reasons", and my argument was that everything he said matched the messaging from the CDC, and Fauci insisted that Trump was basically repeating what experts told him to say, so the people arguing he was doing something malicious were, you know, full of crap.
But in terms of the specifics, Trump said that Covid-19 was just like flu, and that it would just go away. This is definitely not what the CDC and others were saying, and Trump himself acknowledged that when he decided to lie. (This is of course assuming Trump did deliberately lie, because it would be very Trump to just blab something random off the top of his head, and concoct an explanatory excuse later.)
Nor indeed was Fauci lying about masks. He stated there was no evidence mask-wearing by the public would do the any good, which was actually true at the time. The rationale for pushing this was also for a good cause, to prevent a massive run on masks that would endanger supplies for key workers in a time of global shortage. Then as more evidence rolled in, they changed their messaging. Whatever way you want to look at it, you have a double standard here because you want to protect Trump.
The reason we have the narrative that Fauci lied is really - again - all about Donald fucking Trump. Because that orange oaf did completely mess up the messaging on covid-19. When that plainly set him at odds with the advice from Fauci, CDC, and other healthcare experts and agencies, Team Trump at the White House and their media minions set out to damage people like Fauci in order to protect Trump. Fauci batted away criticism of Trump to stay on-side, because if he were marginalised he couldn't do any good. Of course Trump ended up marginalising him anyway, partly out of envy at Fauci's better trust with the public, and partly because Fauci wouldn't demean his self-respect and post by reinforcing Trump's bullshit. This is exactly the sort of dysfunction Trump's incompetence and stupid, petty, narcissistic ego brewed and that you want to run around excusing.