In particular, the lack of a "status quo" option for Crimea (the referendum only had two options, go independent or join Russia) and the lack of international observers (OSCE observers currently in the Crimea were asked to leave by the Russian authorities in the area) made the whole thing iffy from the get go.
And that's not even getting into the fraud allegations ...
There was no status-quo option because at the time, according to the dominant legal opinion (as in, backed by force), Crimea had already seceded from Ukraine. To consider the status quo that Crimea was part of Ukraine would undermine the legal basis for a referendum without assent from Kyiv, which is why it was not included. It's for sure bullshit to the moral level, but it couldn't have been done differently while still being a referendum on joining Russia. They could have done a referendum on returning to Ukraine, I guess.
One problem with many mainstream outlets is that they are often give free passes to organizations like OSCE. For example, the OAS, an organization that serves a similar watchdog position in the Americas, completely bungled their duties in recent Bolivian elections. So much so, that they helped legitimize a violent far-right coup in 2019.
https://en.wikipedia.org/wiki/Holodomor#Aftermath_and_immedi...
Saying he is "pro-Russia" is a big claim, because you're saying their position on Russia's action are overwhelmingly one of agreement. In that clip he appears to call Russia's actions defensible (which is not the same as agreement) on the Crimea issue, while being unclear but likely opposed on the Donbas issue.
Also given that many people are capable of more nuance than blindly supporting or opposing a country on every issue, you might as well be calling them a simpleton.
Russia is bad, but so is Ukraine and NATO, too. Russia is bad but Ukraine does have a Nazi problem. People like him are probably the greatest contributors to the large amount of Gen Z who are unsure as to who they support.
If you're arguing that young people should accept that Russia (which is already a complicated concept) is universally Bad and the western friendly powers (another nearly uselessly complicated concept) are universally Good then you're arguing for a false view of reality. Give the public a little credit, they can tolerate a little bit of moral ambiguity and still make a reasonable decision of right and wrong.