From your own link, which you seem to fail to understand
" If you hire a freelancer, consultant or contractor it means that:
they are *self-employed or are part of other companies*
they often look after their own tax and National Insurance contributions (NICs)
they might not be entitled to the same rights as workers, eg minimum wage
you’re still responsible for their health and safety "
See that word "self-employed-"??
A journalist may be "employed" to write a regular column but the legal responsibility of the publishing agency starts and ends with the article or column.
A newspaper may choose to dispense with a journalist's services (also known as "ending their contract") if , by association, they bring the publication into disrepute.