I was curious why and the answer is stupider than you'd think:

The circle in the image is an embedded PNG which has not been pngcrushed at all.

Instead of building a few gradients out, it looks like whoever did the export to svg out of Illustrator or whatever let it export this horrendously large circle. With a gradient. That costs 2.5MB.

Maybe it's an easy way to speed up the page load if the boss ever asks them to. You have to carve out a few CYA options when working for a hostile manager.

E-comm team has the highest turn over, maybe it is an easy CYA fix, maybe they just followed whatever design said the logo should be. Great catch though.

Looks like that's accurate. Deleting the png from the defs makes the svg 11kb.

For your convenience, some moron used the entire above-the-fold on a 16-in mbp to tell you what site you're on with a png.