No idea if MAN turned any diversions away today or not, but there's absolutely no room at all to park anything. There's even a TCX 76W parked on stand 206 in Terminal 2 (TCX use T1) due to lack of remote parking.
Also there's a Flybe plonked on the currently closed stand 23 in T1 (They usually use T3).
I don't understand how MAN's 'nodiv' NOTAM compromises safety? It doesn't at all. The NOTAM is taken into account during flight planning, as is the additional fuel required for the 'new' altn airport if required
It's absolutely no different than MAN RVR's being below limits in periods of bad visibility, aircraft from neighbouring airports don't suddenly dropping out of the sky because they can't make MAN.