"Aren't Haplotypes used in reference to mtDNA in addition to Y-DNA tests?"
That's correct, but ancestryDNA also happens to look at some of the things on the Y chromosome related to haplogroups. To clarify, the haploTYPE consists of your values for specific "markers" known as STRs and are shown as a series of numbers. Your haploTYPE can then be used to predict your haploGROUP, i.e. your ancestry. To actually determine your haplogroup, there are other types of markers called SNPs, and those are what ancestryDNA looks at. Therefore, if ancestryDNA tests SNPs that also correspond to ones used for haplogroup determination, you can use that to determine the haplogroup. It's inconsistent though, some groups will have their corresponding markers tests and others willl not.
To determine this for your DNA you have to look at the raw data since ancestryDNA wasn't designed to report haplogroups and only uses those SNP values to compare your DNA for matches and ethnicity. The same goes for medical information. That wasn't their intent, but some of what they report can be used for that.