With your January switch to H1B status, every day counted towards the “Substantial Presence Test” (the IRS discusses this here.) Note that there is a “closer connection to a foreign country” exception, but assuming this isn’t relevant, your employer is indeed correctly treating you as a “resident for tax purposes” for 2022.
This, of course, means you’ll be filing a form 1040 now, and can use TurboTax! (Welcome to our Community, @Aj2303!)