That is an amazing shot! I have tried many times to take pictures of the moon through my 8" Dob by holding my (older) Pixel up to the lens and can never get it to line up right/hold it steady enough.
Regarding the glare I wonder if a CPL filter would help, something along these lines (just speculating, I haven't tried): https://www.walmart.com/ip/37mm-Professional-Cell-Phone-Camera-CPL-Lens-Filter-with-Clip-for-iPhone-6-6S-Plus-Samsung-Galaxy-S8-Android-Smartphones/ or maybe combine the filter part with something like this: https://www.amazon.com/dp/B08XH5F7NX