Those vs They vs That

In the following example conversation, what will be the best way to ask if the given resources help the person?

Example conversation:

John: Hey Joe, I need to improve my chess, please help.

Joe: Hello John, please check these links: http://example1.com and http://example2.com. Let me know if [those, they, that] help(s).

Thanks!

Each is valid but has a slightly different meaning:

Let me know if those help.

Let me know if [the things that I just mentioned] help. (Especially appropriate if this is not the first link or set of links that Joe has provided.)

Let me know if they help.

Let me know if [the links] help. (Especially appropriate if this is the first communication about links. Joe isn't expecting there to be a need for any links other than the two in this sentence. And he isn't necessarily offering to gather more. He just wants a status update later to see if they were or weren't helpful.)

Let me know if that helps.

Let me know if [my response] helps. //OR// Let me know if [your act of checking the links I provided] helps.

Let me know if these help.

Let me know if [this set of links] helps. (Especially applicable if this is not the first set of links provided.) Obviously this is essentially the same meaning as "...if those help." The difference is extremely subtle: the word these implies somewhat more ownership over the links. If I talk about those links, I'm sending them out to be used or not. But if I talk about these links, I still have an interest in them for my own sake. This interpretation is not absolute, but it offers a rough idea of the subtlety that the reader may choose to confer.

Let me know if that...um...those...these...help.