That’s because the setting of the Eldraeverse isn’t hard SF. It’s firm SF.
For our purposes, that means that known physics is obeyed, but I get to embrace and extend it so long as my extensions conform with the correspondence principle, and so long as I also stick to the One Big Lie principle – i.e., that all the “space magic” is an outgrowth of the same family of effects, even if it’s a pretty big one.
Which I do.