The point still holds to compare Covid vs flu+pneumonia then. This is some weird No True Scotsman argument you're making where it's not the "True Flu" if they had pneumonia as well... (likely getting pneumonia because of the flu) I doubt the dead people would be comforted by such a subtle distinction.
The plus operator here is "and/or" not "and", but I presume you must have understood this. The GP's point is that flu+pnumonia = (flu) U (non-flu pneumonia). Nobody is denying that flu with pneumonia is flu.
What's really happening is that some people are trying to compare deaths from Covid-19 to deaths from the typical flu/pneumonia season. Nitpicking about what is or isn't the flu really doesn't matter, what matters (to me at least) is how many more deaths Covid-19 is causing than normal "flu/common cold/pneumonia/whatever" deaths which happen every year.
The CDC's figure is "flu or pneumonia" (non-exclusive). The majority of the moralities included in it do not have influenza.
Maybe about tenth your figure, once you exclude non-flu pneumonia-- which is about where we are now for covid19. Flu death figures are Flu+Pneumonia because they usually don't check. Efforts to separate flu from flu + pneumonia all result in flu being a small fraction of the total ( https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3827586/ ).