I wouldn't say it strengthen the argument. The Panic Room incident is hardly convincing as Serena had a sister who was murdered in 03(Gang Murder)so the idea she got spooked by a visiting doping officer is pretty legitimate(The doping officers turn up randomly and unannounced for obvious reasons).
Also last season was one of the poorest Serena's had(If she's doping then it's not really working) and then the last years we've seen other players go toe to toe with Serena and at times hit her off the court(If Serena's doping then we should question anyone who beats her as well,although this is never ). And then any actual evidence is at best minimal(I can't find any creditable source carrying these claims, it appears to be mostly internet blogs.)
So although I'm in no way a fan a Serena(After watching her documentary I ended up disliking her even more,which was odd) It's clear her and her sister get so much more shit than any other tennis player just for been very very good.