All leftists (communists, anarchists, syndicalists, etc) agree that capitalism must be dismantled. The most moderate faction within leftists are democratic socialists, who believe that capitalism can be dismantled through democratic legislative action through existing parliamentary/congressional system. This means forcibly repatriating assets such as large tracts of land and companies from the rich through a majority vote. Of course, the rich will not agree to this but democratic socialists are going to do it anyways through electoral means.

This is the most moderate wing of leftism, but it is still considered authoritarian since it removes private property from the bourgeois without their consent. So to answer your first question, there is no moderate version of the left since all of them are authoritarian. Hexbear is a leftist unity instance in which all leftists are tolerated while Lemmygrad is a more limited marxist-leninist (tankie/communist) instance. So to answer your question, we're the tankies, but all of us are "authoritarian" here if they're leftist.