We didn't need to complicate the meaning of holder. We can simplify it by saying that those who hold Bitcoin on any platform, like an exchange or personal wallet, as long as it was their money spent, are called holders.
I don't think anyone here sells their coins right after they buy them. And they tend to hold, waiting for the right timing. Whatever they call themselves, short-term or long-term holders, it was just the same. So I think there is no need to argue about it because, for me, everyone who is here in crypto is considered a holder.
It's just that some think hodlers are only those that hold for long enough, some years or so, whereas others - they are traders or not worth considering.
Those who hold for a while are called holders. Even if they are traders who can not sell because of the price is down for temporary.
It will better to hold in our personal wallet and not in exchanges. We don't know how good the securities of the exchanges. We can feels okay if we can hold it in our own wallets because we control that Bitcoin and can spend it without any requirements. We are responsible with our Bitcoin without any parties involved.