Nope. There may have been question marks on some of the model assumptions. The 500k dead figure is entirely valid.
"Lockdown stopped 470k Covid-19 deaths in UK, say researchers"
470,000 + 41,000 = ?
"We find that across 11 countries 3.1 (2.8–3.5) million deaths have been averted owing to interventions since the beginning of the epidemic"
Modelling based on pooled data from 11 European countries indicates that non-pharmaceutical interventions—particularly lockdowns—have had a marked effect on SARS-CoV-2 transmission, driving the reproduction number of the infection below 1.
www.nature.com
Look, I fully get it that some people are so completely fucked off with COVID-19 measures and are desperate for some return to some kind of normality. Especially true I would imagine if you are in a low-risk demographic. So I understand why people want to downplay the severity of this. Perhaps subconsciously rather than consciously?
But it does not change the fact that if you have a deadly disease spreading unchecked through a community then inexorably and inevitably it would spread until the population reaches herd immunity. You could debate how long that would take, but what you cannot debate is the end point. And that end point would be 500,000 to 700,000 deaths in the UK. That is the point at which we would have reached some kind of herd immunity. Before that, it would just continue to spread and kill people.
Now I do agree that the 500,000 figure is unrealistic because measure WOULD be taken, as indeed they were. Once we got to 100,000 dead 200,000 etc and the NHS had collapsed, we would have been forced to put in draconian measures. So the 500,000 is theoretical. But it is a very real projection of what WOULD have happened were no lockdown or other measures have been introduced.
And that's important. It might only be a theoretical projection but understanding that this thing would kill half a million people in the UK is critical to our understanding the importance of the continued social distancing etc. And critical to our understanding that "Oh fuck it, lets just go back to normal" is an impossible choice.