I think it should be made way more clear - and here I take the opposite stance of the person you're replying to.

Change title to "Comprehensive Mask Material Testing" or "Comprehensive Mask Fabric Testing" or similar.

Similarly; "...that's why we're testing the filtration capabilities of every mask in our laboratory"

At some point (on the front page, above the fold) there could be a small notice box explaining the difference, or ?-link or tooltip to read more.

I think a lot of the suspicion you're facing in this thread wouldn't have been there if it weren't for that ambiguity, and the need to go into deep content to resolve it.

For someone who just browses to your site and spends 5 min finding "the best mask", they would never realize as it is today.