Sump Pump Installation in basement

Hello.
I haven't taken a photo, but you should be able to visualize this.
Our house is a large, 10 year old ranch.
The basement is very large.
It has one sump pump installed in a corner of the basement floor.
It looks perfectly normal except for one thing I've never seen before.
The top edge of the sump hole is about 2 inches higher than the rest of the basement floor.
And to finish off the job, whoever installed it back filled the concrete floor to taper the concrete between the lower basement floor level and the top edge level of the sump pump. It also seems like this backfiling was done after the main basement floor was completed. I only say that because the top finish of the tapered part of the floor is definitely a different texture than the rest of the basement floor, as if someone did it by hand. This tapered area is probably about 6 feet in length all around the sump pump so it is barely noticeable.
So, it is sitting higher than the floor by a couple inches.

My only question or concern with this installation is that if for some reason, the floor developed any kind of leak - either from outside water or a plumbing issue, it would not be able to drain into the sump pump.

Do you think this was done on purpose?
I just seems strange to me.
Thanks,
Wayne.