You already answered the question in the first sentence when you define the word hodlers.
It didn't say what wallet needs to be used to be considered as a Hodler or where they need to hold their coin.
Hodlers are those people who bought and hold their coin for a long period of time.
Now if those who owns Bitcoin for a long period of time and had it sitting in trading sites and didn't sell it aren't consider as HODLers then what should we call them?
Good question. I also want to know how long a person needs to HODL his bitcoins to be considered a HODLer. Can one HODL for 6 months and still be seen as a HODLer?
I have been thinking that since keeping your bitcoins aside for 6 months cannot be considered trading, it should then be HODLing. I will welcome a contrary opinion because I am here to learn.
About where the HODLer chooses to store his bitcoins, I have always thought that it doesn't matter. Now I am seeing many contrary opinions. I too wish to know what people who store their bitcoins in wallets they do not have overall control over the private keys are called. Or are they just wasting their time?