This is reddit-tier analysis that is commonly repeated and completely incorrect. The Democratic Party in America has policy positions that are significantly to the left of left-wing parties around the world, as well as positions to the right. Any political analysis that doesn't recognize this has major shortcomings.
To give an example, Democratic-run states in the US have significantly more permissive abortion policies than anywhere in Europe. They're also further to the left on drug legalization, restorative justice, and immigration. This also holds true with policy positions at the national level.