He did, but till 2014.

From the author:

Past tense. Kolomoisky funded militias at the outbreak of fighting in 2014. No more.

Zelensky and Kolomoisky's link is separate. Z made TV shows for K's channel from 2012, and K backed him in 2019 election. Since then the relationship has broken down

You are insinuating that Zelensky and Azov are somehow tied together because they both received support from Kolomoisky. Kolomoisky is a dangerous guy (because he's a massive alleged thief who embezzled over $4.5B from his own bank) -- but he's not a Nazi

Like Zelensky, Kolomoisky is Jewish. He backed far-right militia in 2014 not out of ideological reasons, but for the same reason many Ukrainians did: because they were among the few Ukrainians willing and able to fight Russia while the state was in disarray
he far-right in Ukraine gained prominence in 2014 not because they were strong, but because the state was weak at a time that it was under existential threat. They fare very poorly in politics and have been sidelined more and more.

Despite, backing Zelensky, Kolomoisky has also been sidelined. The far-right's main institutional backer, former interior minister Arsen Avakov, was also pushed aside by Zelensky

Your point actually leads to the opposite conclusion than you think it does. The far-right saw an opportunity for influence in 2014, but failed to translate that into power, and have steadily been squeezed aside as Ukrainian democracy has strengthened.