I assume the guy you are referring to is the same guy who, in another thread, has said Jayon is "stupendously bad", and while I agree with him that tackles are not a tell all stat, he takes the position that they mean nothing at all. By his version, if a stat doesn't tell everything, then it tells nothing. If that's the case, then no stat means anything.
The tackles stat at least mean Jaylon was active, and was relied on to make an unusually high percentage of the tackles for the team. That actually does mean something.
Does it mean he was "great", or a "star" or played at an All-Pro level? No, it doesn't because other factors would have to be considered along with tackles to reach that conclusion. But it does mean he was carrying a large part of the burden for making tackles, so he did have value, and is contributing, even if not as much as we think he could or should have. At a minimum he was an average to solid LB.
