Tabloid is a form factor for a newspaper - roughly defined as 'half of a broadsheet' - and not directly related to the content of the publication. It got a bad reputation because lots of trashy publications are published in this form factor but this is not its defining characteristic.

Aside from that Wikipedia is not a good source to decide whether a publication is to be trusted due to its heavy political bias. The New York Post has a conservative bias while (English-language) Wikipedia has a heavy 'progressive´ bias as is reflected by its list of what they consider to be 'reliable/perennial sources' [1] which closely resembles a political litmus test.

[1] https://en.wikipedia.org/wiki/Wikipedia:Reliable_sources/Per...