This is true.
But also it's a high standard to say that those who believe the observed conditions call into question the official data, must be able to support it with their own data. In that context, anecdotal evidence can be useful, if it is from a credible source. If the same anecdote appears in multiple locations, it can be a basis to draw conclusions. Yes, they're caveated conclusions of course, they're not necessarily reliable - but not dismissible out of hand.
But you're right that it's not data and so it's only so useful. It's all very challenging for sure.