The Health and Safety Executive hit out at Tetra Technologies after it was fined £350,000 over the chemicals blast.
An unauthorised campsite was set up at St Fittick's Park at the weekend.
Four neighbours opposed the plans to turn the former refuge and guest house into a home for ten tenants, while the developer promised it would be quieter than when providing safety for "battered wives".
The company wants to hire more than 200 staff for their headquarters at Marischal Square.
Contractor Philip James Moir said it was a 'miracle' that he wasn't killed by the blast.
The TV presenter is touring the north-east.
Prime Minister Sir Keir Starmer has sharpened Labour's pledge to ban new licences for new oil and gas field exploration in the King's Speech.
Senior figures are taking the phone and broadband utilities company to task after year-long talks are no closer to ending fears of an open-ended delays to the multi-million-pound work on the Castlegate.
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