So how did he platform them? All the article offers is that he linked to the blog of a person that neoreactionaries also like. If that person has said or done anything controversial, the Times should say so. Instead, they just try to tar by the fact that bad people like him (something he has no control over).

Note how far removed this is from Scott Alexander himself.

It doesn't say he linked to the blog of a person that neoreactionaries also like. What the wording implies is that he linked to the blog of a person who is himself a neoreactionary and whom white supremacists also like. At least based on Wikipedia's narrative [1], it seems like Nick Land is in fact associated with the neoreactionary movement.

[1] https://en.wikipedia.org/wiki/Dark_Enlightenment

Then there is the another argument about allowing to use the blog comment section for promotion of neoreactionary ideas.

Which is kind of core to Scott's "Grey Tribe" ideas about free speech, but is very much against the "Blue Tribe" ideas of "no platforming nazis" etc.

Indeed.

It is true that Scott linked to Nick Land (and also Charles Murray but that is a different discussion) in his blogroll.