He was travelling with a 73-year-old fellow passenger in a Malaysia-registered taxi.
The resident believes the lack of enforcement encouraged others to park there illegally.
The abuse began when the victims, now aged 22 and 25, were 15 and 18 years old.
It remains unclear how the worker ended up inside the pipe.
The cash refund was eventually processed, and the swim school founder apologised.
Two people sustained minor injuries and were taken to hospital.
Tanjong Pagar United were also fined S$2,000 as the host club responsible for access control to official areas.
The young girl encountered his indecent acts twice on that day.
The altercation was reportedly linked to disorganised boarding procedures and last-minute seating changes at the airport.
They will consider responding on a case-by-case basis, with mass accidents and the elderly being given priority.