What you have here, is another garage where the mechanics know more than the
manufacturer.

Earle

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The first change should be early, not late. If you crank a tight
left-handed turn in a dry, paved parking lot, are you hearing a noise
like your park brake is dragging, or a shudder, like your spare tire is
being dragged on the pavement? That would be exhausted differential fluid.

Dealer is a goof. It apparently doesn't last 30,000, especially the
original fill, since it picks up moisture and the brake-in contaminants.

'Curly'

I think the 15/30K  schedule you stated was first implemented on
MDX's, and the Pilot required its first change at 30K.  Sounds like,
if anything, Honda is now requiring more maintenance for the Pilot
than it used to, not less.

Find a new dealer 'cause this one is screwing with your car.  Sounds
like another stealer that wants to inspect the hell out of things
without really investing in materials to do a meaningful job.  (For
example, "Inspect for transmission service" means pull out the
dipstick and look, charging top dollar for the privilege, rather than
changing the fluid as a matter of routine.)

Document the situation and what the first dealer told you about a 45K
change in a letter, and send it to those bozos certified.  Send a copy
to Honda. That's to back you up if your diff shows problems later.
You can just bet these guys are not going to support you when the diff
burns up and they hand you the Big Bill.

Now, having found a new dealer, go buy a gallon of VTM-4 fluid from
them, and the 2 crush washers you'll need (about $34).  Go to an auto
parts store and buy a fluid pump that fits a gallon size bottle.  It's
about $8.

Take a ratchet and preferably a short extension and remove the TOP
plug in the diff.  Having ascertained that it will in fact come off,
remove the BOTTOM one and let the fluid drain.  Replace the bottom
plug using a new crush washer.  Now take the pump, place it on the
VTM-4 bottle, and pump in the new fluid.  It will take about 3/4 of
the gallon or a little more before flowing out.  Loosely put the top
plug in, and drive it up and down your driveway several times.  (Keep
the wheels straight and hit the VTM-4 lock button.)  Now take the top
plug back off, and put in fluid again until it comes out the top.  It
will probably take about 6 or 8 more ounces, and you can bet the
dealer doesn't bother.  Now put the top plug in with the new crush
washer for real.  From memory, it is about 24-26 foot pounds, and
that's not a whole lot.  If the tire for the Pilot is underneath the
vehicle like the MDX, you can make this a lot easier by removing the
tire first.

Save your receipts in case you need to show Honda that the job was
done.

A lot of people report that the fluid looks brand new coming out, even
though it is the first break-in fluid.  It will probably at least have
a sheen riding on top consisting of fine metallic particles.

I'd be suspicious of everything this dealer has "done" on your Pilot.

My dealer didn't do it at 15k until I reminded them, but I haven't heard that
it can go to 45k.  There's a procedure to do the change on http://hondapilot.org
if you want to try it yourself.  There's lots of other good information
there as well.