No, the results would be worthless only if your threat model were significantly different than the one that Mullvad was operating under. In which case, having the threat model detailed explicitly is already valuable to you.
For example, this X41's threat model only supposes that an attacker could execute code on the system as a different, unprivileged user. They don't consider the situation where an attacker might have an administrative account on the system.
For my personal devices today, this matches my threat model. If an attacker has an administrative account on my machine, I assume that my VPN isn't going to be able to protect my traffic from them. There's no need to worry about laying out all the ways this could impact Mullvad's client.
For example, this X41's threat model only supposes that an attacker could execute code on the system as a different, unprivileged user. They don't consider the situation where an attacker might have an administrative account on the system.
For my personal devices today, this matches my threat model. If an attacker has an administrative account on my machine, I assume that my VPN isn't going to be able to protect my traffic from them. There's no need to worry about laying out all the ways this could impact Mullvad's client.