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Having the oil level too high cannot increase oil pressure. The oil pressure is dictated by the pump which has a pick-up in the bottom of the sump - how much oil there is above this pick-up is irrelevant. There is a pressure relief valve too.
The problem with over-filling oil is that the crank can whip up the oil into a froth and get in the EGR and breathers and make a bloody mess. If they drain 1/2 a litre out it will be fine.
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Ian
Current: 2021 G21 330i M-Sport
Previous: 2018 A6 Avant S-Line MMI+, 2014 F31 320d M-Sport, 2013 F10 520d M-Sport, 2011 F10 530d M-Sport, 2008 320i M-Sport Coupe, 2002 325i, 2001 318i valvetronic, 1998 318i, 1996 525i, 1990 Porsche 944S2
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