Not true as flu strains mutate into completely new strains that we have no immunity to.This isn't meant to be a jab at your or anything, but one problem with comparisons like this is that you're comparing a known outcome with an unknown. It's impossible to say that cases now wont be higher (or lower, for that matter), so saying that 'the flu is worse' because you have an entire year's data vs a handful of months isn't an accurate comparison.
Also, recognize that the totals for covid are still rising *despite* an unprecedented level of response. What would flu levels look like if we had social distancing? Yes, there is heightened awareness and fear, but also heightened response and yet we still unsure if we've done enough.
And when comparing deaths, the two have a distinct difference in natural immunity. We know the flu, have vaccinations for it and have exposure to it for all our lives. Those things play into a natural response that helps most people get over it better. We don't have that with covid 19.
But as has been stated many times, most people will get over this and a certain percentage will die (in much the same way as with the flu). But the load on our health system will play a big roll in what happens to the group that will get it and will need medical treatment. I think that is something that a lot of people miss when making the comparison to the flu. The rate of speed here is going to force a lot of tough choices to be made and the overall fatality rate will be affected by those choices.
https://www.verywellhealth.com/new-flu-virus-strains-2633828