According to Dmg04 they aren't, but according to Kevin Yanes, they are.

they arent retroactive as in Sesson 3 counts, but season 4 ones already done count. the wording of the questions were vague and the answers given way to simplistic

Two different bungie employees said two different things. Kevin Yanes said anything with a rank is retroactive, however, someone specifically asked DMG04 "Does resetting your valor rank counts retroactively. For example if i reset the rank 2 times before the step does it count for the quest step or no?" He replied "Nope" See below link to the twitter post for source. [url]https://twitter.com/a_dmg04/status/1030592428212776960?lang=en[/url]