Looking at their products they do numerous testing kits for numerous different scenarios. Pool test kits, aquarium, urine etc. I think they probably just throw a load of semi-relevant tests on a strip as a marketing gimic. "We have a 9 in 1 test strip everyone elses only has 5 or 6 in 1 tests," even if a lot of the tests dont really tell you much. 1 test not included is ammonia.
Like i said alkalinity and carbonate hardness are generally considered the same thing in aquariums even though they are slightly different. They probably have a test for each and just threw them both on even if they will both tell you pretty much the same thing.
Noticeably a lot of the reviews on that product are pretty poor, and the general impression within the hobby is that liquid tests are more accurate than strips. I would recommend a basic liquid test over strips even if it doesnt cover all the bells and whistles of a 9 in 1 test strip.