According to this blog post by michael cade , it seems that reverse incremental backup should be called forever reverse incremental backup instead, if indeed there is only one full backup file and many VRB files.
Is there a reason not to also have intermediary full backups like in the forward incremental ?
However, used by Michael is the official "historical" name of this backup mode that was used for the past 13 years since v1, which is why we're sticking to it - because this is the name our customers know and used to.