Given that the Yemen Houthi rebels are busy trying to hold on to Yemen, and suffering regular setbacks. (the appear to be losing the war right now) It is extremely doubtful they have a million, or even a few thousand extra fighters - and the associated equipment and resources - to throw around going after Saudi. Sure, attacking Saudi bases as a tactic to try to reduce the effectiveness of Saudi strikes in Yemen makes sense. No way they have a million people to throw into the effort though.
Exactly.
This is the last gasp of a defeated faction. Interestingly it comes from an Iranian source. Iran is losing big time in Yemen. Soon Hadi will be back in the palace in Sanaa.
The Saudis would make mincemeat in a matter of hours with a ground incursion from Yemen. Sitting ducks. This is total fantasy, wishful thinking on the part of the Iranians.