You are right, but honesty does not do everything.
Some traders may be overly optimistic and think honestly that they can achieve performance they will never have.
And above all nothing is frozen, if a strategy that has worked for many years suddenly loses, the honesty of the trader will not change anything.
In my opinion, what matters most to estimate future performance of a darwin is rigor and adaptability of the trader and the length of the track record.
However, it is difficult to judge rigor but the activity of traders on this forum can be a good indicator.
For example, I think you have that quality given the rigor with which you keep your community portfolio up to date.
Adaptability is probably the most important element but also the most difficult to detect.
Therefore the most important verifiable element seems to me to be the content of the track record, the longer it is the more information it brings.
Personally I do not take any consideration of the migrated part of a track record for the reasons that have been cited.
The problem is that there are very few interesting darwins with a track record sufficiently long to define a realistic expectation of performance.
It will therefore take a few years to see more clearly.
Trackrecords will be increasingly long and reliable and there will be more and more traders performing.
The more time will pass, the greater and more accurate the expectation of performance will be.
So wait and see.