Depends on where you are from. In most, if not all, western democracies the Democrats pass as centrist. People like Bernie pass as slightly left of center in Germany for example. And passes as left parties over here would considered full-blown communist in the US.
That's just not true of the Democratic Party by any useful metric and likewise there is nothing about Bernie's platform that would be centre-left anywhere in Europe, the majority of his proposals being to the left of anything implemented anywhere.
If I understood the NYT article correct, the Democrats are put left, among other things, because of support for climate measures. Fun fact, the CSU, as far right as you get in Germany when you ignore the AfD, is also supporting measures to fight climate change now. The CSU also kind of opposes gay marriage, are among the more extremer views regarding abortion. And support public health care. They do not fight to make abortion illegal so. No do they with gay marriage. I see that as them being more "left" than anything I see coming from the GOP at the moment. And the CSU, as I said, considered the most right / conservative of our mainstream parties.
Bernie on the other hand would fit in perfectly well with the SPD, our social democrats. "Die Linke", the leftest one in the article, is a joint party of the SED (the former DDRs government party), some communists from western Germany and the far left wing of the SPD. They are as much left as the AfD is right.
I do see a lot of parallels between the AfD and the right wing of the GOP so. Especially regarding immigrants, muslims, the Covid pandemic and views of family values.
