A simple forum rank cannot be used to determine how knowledgable a person is.
Exactly this.
It's impossible to say if someone is knowledgeable just by having a look at their Account rank.
There are so many possibilities:
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Account has not many posts and it's very old: I can be logged in all the time in my account, it's still a Member account but my knowledge keeps increasing due to reading (type less, read more).
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Account has not many posts and it's very new: I can even have no knowledge about Bitcoin at all right now, put in some massive effort by investing some time and I'll gain knowledge quickly.
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Account has many posts and it's very new: Some people have a lot of time and might do both, writing posts and reading to gain more knowledge.
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Account has many posts and it's very old: Heck, there are even Legendaries in this forum, they are completely clueless how Bitcoin etc. works.
...
There are so many possibilities, it's just impossible to judge the knowledge of some Member / Full Member / Sr. Member...
And that's not limited to Bitcoin, it's like that for basically anything, like traditional investing or science of all sorts...
I’ve been on the forum for at least 3years and my total time logged in is just about 51days.
Sometimes I'm even not logged in, like when I'm just browsing this forum. This is also a case, where neither my post count nor my time logged in will increase from.