[Taiwan] My friend (33M) is flying to Hong Kong/Shenzhen next week to meet an online "girlfriend"(40F). Scam?

A 33-year-old Canadian man in Taipei is flying to Hong Kong/Shenzhen to meet a 40-year-old Chinese woman he met on a dating app. They communicate via WeChat translation, have discussed marriage, and the woman claims to be a wealthy entrepreneur with a teenage son. Concerns about a potential scam arise due to her lack of online presence, suspicious behavior, and his decision to travel to mainland China despite warnings.