I acted on clue that it should be spring loaded from homedepot guys. I didn't know what that really means but I tried to see if I can pull down the assembly and it does pull down!
There are two anchor points which sort of spring loaded. I was able to pull one side down only which allowed access to the bulb and I replaced it. I don't think it's necessary to pull down from both sides but I guess that could be done too.
After replacing the bulb, I just pushed it up and all done so it was kind of easy.
You do have to put a little bit of force to pull it down, I was scared if it will break or something but no.
Given this information, you can examine the fixture again and can probably spot the two anchor points inside the fixture (or note that fixture is tied at two points when you pull down) so you know that's the mechanism you have.