But the idea that general IT security companies have a reduced chance of hiring someone based on their information being on social media is... not the case.
Unlikely that they are a front to a US operation. But very likely that it's a start-up that leverages the currently toxic climate in order to get themselves in the news. Making half baked attribution claims is a perfect way to do so. One might even say that not doing so would be leaving money on the table.
I have some contact with cybersec in Europe and it is very common that cybersec professionals in gov and mil positions do not have any social media accounts under their own name, and certainly not linkedin. Social media makes you too much of a target and reveals too much about your org. When promoted to a public-facing position the person then suddenly "appears" from nowhere and the media profile has as little information as possible. Real professionals use those accounts only from designated computers, and if you are high ranking enough (head of...) in fact never use them at all, but rather have someone else using them for you. All in the name of keeping your own actions and locations away from the curious.