As I read it from your link to the EU site.
“Generally, a short-stay visa issued by one of the Schengen States entitles its holder to travel throughout the 26 Schengen States for up to 90 days in any 180-day period. Visas for visits exceeding that period remain subject to national procedures.”
90 days out of 180 applies to those needing visas.
And here
gov.uk/visit-europe-brexit
“Visas: you should not need one for short trips
After Brexit, you will not need a visa for short trips, according to European Commission proposals. You could stay for up to 90 days in any 180-day period. You may need a visa or permit to stay for longer, or to work or study.
Check back for updates.”
Does that mean that multiple short trips are OK, as no visa required, or that multiple short trips totaling over 90 days are not allowed unless covered by a visa?
The “proposals” “may” and “check back” are not confidence inspiring are they?
Couldn`t get on with that “activenews” link though. Multiple tabs opening etc.