It makes sense for local texts like signage at site to omit location prefixes/suffixes as it can be implied from context (e.g. in Hong Kong "CU" can be taken to mean "CUHK"), so it's not completely indicative of its actual name.

The government websites include "Yau Ma Tei" https://www.info.gov.hk/tb_chest/tb-chi/contents/c614_1July2007.htm https://www.dh.gov.hk/english/tele/tele_chc/tele_chc_shcf.html https://www.dh.gov.hk/english/tele/tele_chc/tele_chc_shcm.html