They enrich uranium. Supervising the process doesn't change the process.

however, they were supervised to not be enriching to bomb level concentration.

the purpose of the bomb shelter seems obvious - israel is gonna be bombing because israel likes bombing stuff

A more accurate way of describing it would be "still enriching, not at bomb level concentration yet". There is no question that they were in the process of "enriching to bomb level concentration". You want to wait until they're done?