Everyone is different, but if you weren't actually able to hit protein macros then I think that's a skill that isn't too hard to improve for most people (if they have a decent reason for wanting to go vegan in the first place).
I've been vegan for 15+ years, and I'm willing to say there are zero health benefits over a healthy omnivorous diet. The people who find one are misattributing it. It's not that vegan is healthier, just that what they were doing before was decidedly unhealthy. For a lot of people going vegan is the first time they actually think about what they eat, read labels etc, which is where most of the benefit comes from.
So they're precisely vegan, with fish.
There is no gray area when it comes to veganism. Just because there is no word for that diet, does not mean you can just twist the definition of vegan for your convenience.
You could easily just say your a pescatarian who doesn’t eat dairy or eggs, and that would be more correct.
The methods say people were allocated to vegan versus "high meat consumption" foods, with participants free to choose their diets. The only restriction was you had to "try" to increase intake if losing weight, and "try" to decrease intake if gaining weight. (i.e. only isocaloric per basal rate, not across the board). Then the linked studies hint heavily that the vegan group tended towards less protein but more fibre, and roughly equal carbs (fat is not mentioned!!). Which at the very least shows the diets were not "equivalent bar for meat", let alone for "moderate" (i.e. potentially healthy) amounts of meat.
So they're not comparing "healthy wholefood vegan vs healthy wholefood meat diets". They're comparing availability and behavioural tendencies towards dietary choices when aiming for a short term vegan diet versus when aiming for a short term diet characterised by excessive amounts of meat.
I honestly don't get why they do studies like this. It's a waste of time for everyone involved. It's almost like they're only after a headline extolling veganism, rather than actually useful comparisons that could lead to real, actionable dietary insights. Really, if anything, a supported conclusion here could even be that meat diets are likely healthier given sufficient fibre supplementation.
This may be correct technique for a small-n, short-duration study.
But don't expect the results to be applicable to typical non-vegans.
As if this planet will even be worth living on if climate change continues to go unchecked. Or if humanity will even exist after the inevitable mass extinction eventAnger is a reasonable response to abuse and exploitation of sentient beings.