This is bad advice.

In general, yes, but that's usually considered bad advice to do from untrusted sources, where as the main Mullvad page would be considered a trusted source, IMO. I understand the sentiment in general isn't a good idea, though.

I dunno, it’s just frustrating to see I guess.

I think sometimes, depending on what is going on in someone's life, you simply do not have the energy, time, or inclination to learn the intricacies of how to use a new technology.

As an example, if someone has kids and is fairly stressed out from their job, and thus has limited free time, it would likely not be at all appealing to have to dive through a manual to learn the intricacies of a still niche distro to learn how to install their VPN (as someone would have to do if they were using it on their own, and not just following the commands of an internet stranger without researching it).

While I do think it's generally good to challenge yourself and be willing to learn new things to avoid learned helplessness, realistically all of us have limited time, and depending on someone's goals and inclination, learning more in-depth sysadmin skills may not be desirable, and different people have different tolerance levels for troubleshooting; some find it fun, other may find it infuriating.

As an example, a professional musician who wants to switch to linux likely would prefer not to have learn the intricacies of Jack, how it's replaced by Pipewire, how to configure the kernel to perform best for low-latency tasks, ensuring their user profile in the correct admin group to access the correct permissions, etc. They very likely instead just want to get back to making music so they can do their job without having to divert from their main task just to learn how to go back to doing their main task.

I think it's quite reasonable that some people may prefer the most direct path to the tasks they normally perform, and may become frustrated at having to learn a totally new skill set to go back to performing their original task.