The s/something/other/ patterns are regular expression replaces.

He's saying you can replace 'something' for 'other' in each of those patterns.

They are (quite obviously) saying that this could be changed to British people commenting on how all of the service jobs are Poles, or Canadians commenting how they are all Indian.

… as a way to express what, though?

That American complaints of this form are not unique and therefore should be disregarded? That American complaints of this form are universal and therefore indicative of a global pattern that should be concerning?

Seems like a pre-Brexit example for Britain.

I feel like AI has ruined hn

I agree! People can't recognize regex-replace statements anymore! a forum commenting tradition that goes back decades.

HN and regular expressions are best friends.

\bai\b

How does AI relate to my question?

Other countries import cheap labor too.