From reading ‘old’ Flat Chat comments on this topic, you might find the following info helpful:
https://www.flatchat.com.au/topic/building-and-maintenance/fire-safety-audit/
Do you have a Contract with this company or were they only employed to undertake an Audit? If there is a Contract then you might need to check the contract carefully about who can carry out the required work. ‘The devil is in the detail’.
If something is ‘recommended’ it probably would not be deemed to be mandatory.