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Probably so if they accidentally upload a confidential document they can claim that anybody who downloaded it (or shared the URLS) violated their T&Cs

Typically it's about media and means e.g. embedding media from their site into yours, or linking directly to that media. If you link directly to an image, say, the user won't see the target website's content, which they might object to.

The lawyer writing that knows that it doesn't matter very much whether the copyright holder regards something as infringement, it matters what courts think, and to the extent that these theories have been tested in court, they have generally failed[1]. You might as well say that you regard "deep linking" as treason punishable by death. They're just trying to frighten people.

[1] eg https://en.wikipedia.org/wiki/Perfect_10,_Inc._v._Amazon.com....

It can be a little wishy washy.

stuff like /about or /contact -might- not be considered a deep link depending on the opinion of whomever is running the site.