Several onlookers at the scene tried to save him but failed.
The 11-year-old left home in just his shorts on 29 Aug.
The two have since left Singapore, and will be banned from re-entering.
Authorities revealed the firm had branded itself as an “international financial services group headquartered in Singapore”.
EMAS and police officers were seen at the site of the accident.
The 21-year-old deceased was reportedly not part of the demonstration.
The man reportedly only returns home to his family once a month to settle bills.
MINDEF takes allegations of unacceptable workplace conduct seriously, it said.
35 trains instead of 40 have been in operation during morning peak hours in recent weeks.
The 108 staff laid off will get "fair retrenchment packages", said the hotel and the union.