Alternative tests to PTA. Is this legitimate?

I found the following at an unverified website (http://dgcamedical.in/ICAOhearing.htm). Can someone please authenticate or refute the following? Class 1 Medical Assessment: 6.3.4 Hearing requirements 6.3.4.1 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, 1 000 or 2 000 Hz, or more than 50 dB at 3 000 Hz. 6.3.4.1.1 An applicant with a hearing loss greater than the above may be declared fit provided that 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. 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’s 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. 6.3.4.1.2 Alternatively, a practical hearing test conducted in flight in the cockpit of an aircraft of the type for which the applicant’s licence and ratings are valid may be used.