Which, That and the Weather

I wasn't certified to teach high school English, at least at the senior level, but for 6 years I loved doing my best and was told by both students and administration that I did it very well. I am not here to brag, but to tell you that although I didn't have the very best background in the subject, I worked at it and became fair to middlin at basic grammar and punctuation. However, I have to confess that I never had cause to concern myself about when to use which and that. Like most people, I have tended to do as the spirit moved me in any particular time. lol

When I saw this link on fb that promissed to explain it all to me, I clicked. It turns out that it should pretty doggone easy. However, habits are hard to break, and I think, when you read the rest of this, you may agree that I should have written which rather than that in the first sentence of this paragraph.

The article  here is not a long click, but I will present is the gist of it here anyway.

If your sentence has a clause but does not need it, use "which"; if the sentence does need the clause, use "that."

If the clause is absolutely pertinent to the meaning of the sentence, you use "that."

If you could drop the clause and leave the meaning of the sentence intact, use "which."

from the website https://prowritingaid.com/art/438/-Which--or--That-:-Know-When-to-Use-Each.aspx

Do you agree that I used the wrong word when I wrote this sentence earlier? 

When I saw this link on fb that promissed to explain it all to me, I clicked.

It seems to be wrong because the sentence still makes sense if we remove the clause. 

When I saw this link on fb, I clicked.

In this case, according to the above explanations, I should have written which.

 When I saw this link on fb, which promissed to explain it all to me, I clicked.

This is going to go against the grain, but I will try to bear it in mind.

Meanwhile, it has been hotter than the hinges on the doorway to hell here this week. With the feels-like temperatures reaching 40+C/100F, all of the southern part of the province has been under a heat warning. It will supposedly break tonight, and we, including Lacey, will rejoice when we can once again open the windows, at least at night.