On AIP charts is says:
Comm failure procedure:
In case of radio failure climb on HDG 179deg, after passing R264 DOL turn left inbound DOL and enter holding. Climb to 8000ft MSL.
It is not connected to any airway because it is used only when radar vectored. To me the only questionable part is HDG to MODRO - I cannot see the RNAV requirement for this departure.
This departure was presumably established to shorten departure clearance (after departure climb straight ahead, at marker west turn left heading 180deg, further by radar..).