There was an era (1990s? I feel old) when "A" was routinely used in "LGBTA" and "LGBTQIA" to mean "ally," at least where I lived. As others have said, this was a time when fewer people were out, and including allies gave cover for people who were closeted to more safely participate. Asexuality was less visible in parts of pop culture then, too. I'm mentioning this context, because for people who didn't live through it, the outdated usages might seem less defensible. That said, I'm not defending the video linked above; it is off/outdated; and I'm +1 to what kuwisdelu said. Allies don't need to be named.
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