Will we see serious inflation 2021?

Yes.

You can't pour trillions of 'printed' US Dollars into the economy without causing inflation.

If you can't see rising prices because of that inflation, you haven't looked closely enough. Don't forget about 'shrinkflation', either; it's the way most companies hide the rising prices until it becomes too obvious.

We're already seeing serious inflation, you just have to look over the edge of the "representative" basket of goods used to calculate most CPIs. Bought real estate or stocks recently? Got a container shipped to Asia? Or some lumber, or computer chips, or etc pp...

We've already been told by those in the government it will be higher than usual, so at the very least, that.

I don't really trust the government to not give misleading figures that make things look better than they really are either.

But I don't think we're headed to proper hyperinflation either, at least not yet.

Probs only for the next 6-12 months.

There’s no structural change that’s gonna keep the velocity of money higher than normal for years and years to come.

Just those low rates and unemployment checks etc.