As well, I'm not happy of this tagging, but ...

Vertiports are a new category of airports usually with several take-off and landing areas for eVTOL and further infrastructure taking a similar role than aerodromes (or heliports). But helicopter are not allowed to land or take-off. 

Official maps (e.g. Geoviewer BW) show the Vertiport in Bruchsal by an additional aircraft symbol next to the aircraft symbol of the "Flugplatz". So, it is distinct from and not part of the "Flughafen" but again similar to an aerodrome. 

Unfortunately, there seem no appropriate or better OSM tag for Vertiports (https://de.wikipedia.org/wiki/Vertiport) and aerodrome seems to be the best match. Tagging as helipad would worsen the mapping since helicopters are not allowed to land or take-off at Vertiports.

As a result I suggest maintaining the existing tagging for the time being.