It may have a defroster heater circuit that kicks on periodically, raising the current draw.
Does it have ratings for the light fixtures? Are you using the incandescent bulbs it is likely rated for, or have you switched to LEDs?
You shouldn’t have any real problems with the UPS, so long as it is rated for the 115v / 10A that the refrigerator is rated for.
The Donvict, in an effort to distract We The People from Luigi Mangione and the impending Guillotine Party, has taken to making insane pronouncements. For example, he wants to buy Greenland, make Canada a 51st state, and rename the Gulf of Mexico into the Gulf of America.