I have to conclude those are Emirate-specific standards, not UAE GCAA 1st class medical standards.
From the UAE GCAA First Class Medical Standards:
Link:
http://www.gcaa.ae/en/ePublication/_.../admin/Library Pdf/Civil Aviation Regulations (CARs)/LICENSING REGULATIONS/Ch. 5.pdf
5.4.4 Hearing Requirements
5.4.4.1 The applicant, when tested on a pure-tone audiometer, shall not have a hearing loss, in either ear separately, of more than 35 dB at any of the frequencies 500, 1000 or 2000 Hz, or more than 50 dB at 3 000 Hz
5.4.4.1.1
An applicant with a hearing loss greater than the above may be declared fit provided that:
(a)
the applicant has normal hearing performance against a background noise that reproduces or simulates the masking properties of flight deck noise upon speech and beacon signals; and
(b)
the applicant has the ability to hear an average conversational voice in a quiet room, using both ears, at a distance of 2 meters (6 feet) from the examiner, with the back turned to the examiner
Note 1. It is important that the background noise be representative of the noise in the cockpit of the type of aircraft for which the applicant licence and ratings are valid.
Note 2. In the speech material for discrimination testing, both aviation-relevant phrases and phonetically balanced words are normally used.
5.4.4.1.2. alternatively, other methods providing equivalent results to those specified previously shall be used.