Those images were shot without a polariser.
You cannot adjust a polariser in flight, that's why they are next to useless on a drone.
People that fly with them them are generally fooling themselves.
I'm not fooling anybody.
If you see something you want to shoot, but there's glare, note the compass orientation of your craft, land, mount a polarizer and turn the front element the direction you need**. Then take off to the same location / orientation and shoot.
Too much trouble for you? Then you must not want the shot. If you're a recreational photography, I understand. If you're a professional of any kind (fine art to commercial sales), then you will do the work, period.
Alternative: at certain angles, you can just turn the craft. It will have the same effect of turning the front polarizer element. If it changes the orientation of your image, you might be able to adjust in post. Use your minds eye and pre-conceive what it will look like on the computer screen.
Important to Note: a polarizer is not a binary on/off. It is mostly nothing at one position, and mostly full polarizer at 90 degrees to that 'nothing' position. There are two locations on the dial that are nothing, and two that are full power (each 180 degrees apart). Then there is everything in-between. If your front polarizrr element / craft orientation is somewhere between nothing and full, then you will get
some results. If you combine this knowledge with the
Alternative point mentioned above, you will
improve your results.
But again, if you have to land your craft to adjust things, then that's what you do if it's important to you. If that means changing the batteries, then that's why you have plenty of them.
Note: reflections are not just from full sun. You can also sometimes not see below the surface of the water when it is simply reflecting blue sky. But you may only want to reduce direct sun glare and don't care about reducing other reflections to see below the surface.
With no polarizer, you can change the craft position to reduce the direct sun glare, true. But then you are changing the craft position and composition of your shot. This might be fine for you. <shrug>
** Knowing how to turn the front element requires you be knowledgeable of what angle will work. which you can teach yourself with the craft on the ground, taking note of the notch mark. Set up your craft and viewing device, and simply turn the front polarizer element to see how it affects the image in real time on your screen.
Chris