That is a rather curious argument. Google's management come from Silicon Valley and statistically will have a left bias. It is quite likely that a substantial number of them genuinely believe that, say, attending a right-wing rally is similar to presenting Mein Kampf as truth with no evidence. If they start censoring one it is pretty likely they will start censoring the other.

Also, if they use controversy as their metric instead, they're going to start squashing minority views. It is actually much harder than you might think to decide what is and isn't obviously true, particularly when there is a team of moderators involved (or team of people calibrating the robots which is maybe how Google does it).

Censorship is really dangerous.