"Links to" is doing a lot of work in that sentence. ProtonVPN is owned by Proton, which has no legal ownership ties with Tesonet. During Proton's expansion into Eastern Europe, Tesonet initially assisted Proton with HR, payroll, and local regulation, so for a period of time, people working for Proton were employed by Tesonet, since Proton had no local subsidiary that could hire them. These were not "shared employees", they worked exclusively for Proton.

In 2016, Proton created its own subsidiary, and these people are now employed by Proton. But for this historical reason, the ProtonVPN keystore on Android still lists Tesonet as the organization name, even though it is fully controlled by Proton.

None of this is "debunking"; these are just the facts. You can make of them what you will, but you should be honest about what actually happened when you talk about it.