Quality issue

Do not put the emphasis on the stock test. That may or may not be the case for your picture. The moderator did refuse your assets probably because of the exposure. Whites are missing, technically your picture is underexposed. Such night pictures are not that easy to expose correctly as you need enough darkness, and no over exposure. 

Having assets accepted on other stock plattforms is no guarantee to get them accepted here and vice versa. Adobe still seems to have a high quality standard for photographs, even that they allow a lot of generative AI scrap to pass.

I would say that you should adjust the exposure and try again, even tht from a composition point of view, I do not think that this is a very attractive asset.

If you have shot this in raw, adapting the exposure should be a nobrainer. Personally, I would probably compose two different assets, one as a shoot without fireworks and then just the fireworks, with less of the surroundings visible. But that will be an option for you for the next shoot, as you need to plan in advance.