I'm wondering if one can put the Global MBA offered by University of London as a QMUL degree? I understand that it doesn't have triple accreditation and accredited by CIM and CIMA, but is it 'accepted' as a 'real' Master's degree, given the disclaimer on their website?

Inline with that, is the diploma issued by QMUL? (also relevant for some of the BSc and MSc programs of the University of London, are the degrees given by LSE?

The degrees are given by University of London. University of London has very real degrees for well over 100years.

LSE has the right to issue their own degrees, which are different than UoL degree. The cohorts are different, the networks different.

When you complete your degree with the University of London International Programmes your award will consist of a Final Diploma and a Diploma Supplement. The Final Diploma will state that you have been awarded a University of London degree. It will also name the member institution of the University of London which provided the academic direction and include the University of London logo and signature

You will not have a QMUL MBA or be an alumnus of QMUL. QMUL's accrediation will not apply to your degree.