Word Usage – Properly Visiting a Website

They is plural of he/she/it. You use they to refer to one group of things that have already been mentioned in the conversation:

A: Are Peter and Laura coming?
B: Yes, they should be here soon. <--they means Peter and Laura

Those is the plural of that. You generally use those in the same way as you use these, to refer to one of two distinct groups of things.

A: Can I throw away these newspapers?
B: You can take those, but not these

When you use those without a these, it suggests that there is some other group, for example:

Those are not uploaded on the website...

this implies that some other items have already been uploaded to the web site.

This is idiomatic but uncommon.

The sense here is that the details are necessary to provide whatever benefit the person is requesting. They may or may not be about "him" directly, but they are for "his" benefit.