"Experts say high gas prices may affect H2 sales to some degree, but what affects the vehicle most is its market-limiting price tag."
And non-experts say the other reason is the drivetrain and body are too old in the tooth. Drivetrain will change next year, and interior, but the body needs a drastic change. And, the release of the H3 just may have stolen some sales.
Just my non-expert opinion.