There’s nothing in Blizz’s T&Cs about using an external “information” website like Helltides. c0m or even maxroll, etc. If it was cheating, they would clearly have that in their “rules”. They know how many people use websites such as the 2 mentioned plus others for builds alone, and they also include maps for Helltides.
Good for you not stooping to our stinky level of looking at a more informative map on a website. Most of us like to play efficiently, that’s how we have fun. Just don’t start accusing everyone of cheating, as it’s coming across now you’re trying to look like an angelic goodie-two-shoes.