Your link explains there are two cases in which Gmail shows e.g.

> 'service@paypal.co.uk' via Paypal-Admins <paypal-admins@company.example.com>

namely:

> 1) The domain it was sent from doesn't match the domain in the "From:" address'

> 2) The email was sent to a Google Group from a domain that has a "p=reject or p=quarantine" DMARC policy

In my case, it's (2): The target email is a Google Group email (e.g. paypal-admins@company.example.com).

Should that make the email more spammy though?