First some definitions:

Mortality rate - #deaths by disease/total population.

Case fatality rate -CFR - #deaths by disease/total diagnosed cases.

The flu has a CFR of about ~ 0.1% (Source: https://www.cdc.gov/flu/about/burden/2018-2019.html).

For 2019 CDC estimates 35.5 million people got the flu or about ~11% of the US population. And 34,200 people died of the flu last year.

So ok multiple that 34,200 by 3 to get your estimate for Covid-19 - 100,000 deaths.

Now lets look at this another way.

As of today (about 3 months into the Covid outbreak) we've had 67,682 deaths. Already this is almost twice the deaths of last years flu. Source https://informationisbeautiful.net/visualizations/covid-19-coronavirus-infographic-datapack/

The flu has a vaccine and a large percentage of the US population has some immunity to the flu because of that. The is no vaccine for Covid-19 at this point in time. So you're looking at a larger percentage of the US population getting the disease.

Even assuming an optimist 15% of the US population has already gotten the disease, you need ~70% of the population covered to get herd immunity. So again optimistically at least 4 times more people get the disease - 67,000 * 4 = 268,000 deaths. If a lot of people get the disease all at once as we've seen in several European nations, that CFR rate for Covid-19 goes up even higher. In the US we've so far avoided overwhelming the healthcare system.

Still think this is just a bad flu.