Well the text is confusing. But so is the RouterOS bridge interface… see @sindy’s “RouerOS bridging mysteries explained”, which pre-dates MVRP and dynamic /interface/bridge/vlan assignments: http://forum.mikrotik.com/t/routeros-bridge-mysteries-explained/147832/1
In 7.16 and above, /interface/vlan (i.e. dynamic config added automatically by RouterOS) has some helpers to set tagged=bridge for the VLAN in /interface/bridge/vlans, IF /interface/vlan’s interface= is set to a bridge interface (and it was not already manually configured). But this logic is independent of MVRP checkbox on the /interface/vlan - although BOTH dynamic tagged=bridge for each /interface/vlan & MVRP came in 7.16 so this appear more related than the are. But agree the MVRP text is better but still confusing since its lot words to say LOCAL bridge interface’s MVRP setting that “win” & MVRP checkbox apply to cases where interface=.