Hello Michael! Welcome to the forum!
Navigraph currently gets METARs from NOAA. It looks like they do not provide reports for the airports you mention, which is unfortunate but also the reason why you get the “No METAR available” message.
We don’t know why this is and have no control over it, but we can look into adding other sources as well! The one you linked to is not optimal for our use case though, I’m afraid. We’ll investigate as soon as we have available resources to do so!
Kind Regards,
Malte