I'm lerning kanji using WaniKani and a set of cards for Ankidroid for offline use. They are giving these weird names to kanji and radicals and I was wondering if those were correct? I feel like I'm learning the wrong names for these characters or their meaning... This is just one example. I came across another one called "mohawk". That doesn't make sense to me. Or am I missing something? Is it a learning technique?
Yeah, it's a learning technique. The general idea is, when you're looking at a Kanji, the character should represent a meaning or concept related to how it's used. For the sub-components, you can call those whatever you want that helps you remember.
It's a little weird that Wani-Kani has you remember the radical separately, under a different keyword. But it isn't unusual at all to have a Kanji represent something else (or a few different possible things) when it appears as a component. It's easier to remember (and to build a mnemonic) if 兼 represents something visual and concrete like 'Mona Lisa' instead of an abstract concept, like 'concurrently'.
But yeah, the actual meaning of that Kanji is something along the lines of 'concurrently', per WaniKani's own definition: https://www.wanikani.com/kanji/%E5%85%BC, as opposed to the 'radical' from your screenshot: https://www.wanikani.com/radicals/mona-lisa So yeah, basically just stick with it and you'll use that Mona-Lisa part to memorize several other Kanji.
(Sidenote: looks like you're going through WK material in Anki, which is good, but know that you can copy that character into WaniKani's search and see their breakdown even if you don't subscribe or log in.)