Is NIBMT, Delhi a genuine institute? I've been told that on the basis of my work exp., I can get my graduation certificate in 6 months?

Yes NIBMT is genuine Institute, it's providing worldwide acceptable courses,  

if you've experience you can apply for admission, for different course providing by NIBMT , remember NIBMT provides distance learning courses for working professionals .

NIBMT is a very good and reputed Institution for working professionals, its certified by ISO 9001:2015 and also certified by KVQA, India.

NIBMT is a fake university in which they are providing the outdated ISO 9001:2008 certified by KVQA, India. The programme is already outdated by KVQA, India in 2018 and the updated programme is ISO 9001:2015 which is currently leading is certifications program. I even called at the HQ of KVQA, India