Can you side flip then go into a hyper strike while in midair

why don't you try ?

got em

isn't that a glitch? not very good for a speedrun

It is possible and only useful if you are going really fast. Then you can (in theory) hyper strike to get extra distance and height. It isn't used that much in the first game as it is used in others... But why didn't you test this yourself tho?