Based on a spot check of some of the bolded words, bolding seems to be used here to highlight links.

The old way of indicating "this is a link" was underlining. That seems to have largely fallen out of favor and most websites seem to use color coding these days.

Those are actually links, but they've decided to sure them in a way that hides that for some reason

I don't get it. The IMO is the organization that regulates international shipping.