I think almost any news coverage can be politicised in the comments, especially with the level of polarisation and discontent in NZ, and the scale of social issues currently in the media spotlight.
I would consider all of the examples posted to be relevant to current affairs, and not necessarily politics focused (though I concede comments on them would likely stray into political debate almost immediately).
Politics to me should be more scoped to stuff like "David Seymour says ", "PM Hipkins talks to us about " etc.