CLARIFICATION ON ACTS THAT DO NOT CONSTITUTE THE SEXUAL HARASSMENT

A married female colleague congratulated the boss on his promotion through a WhatsApp message. He expressed his happiness in reply with heart emoji ❤️. Can this act of the boss be considered sexual harassment under the Sexual Harassment of Women at Workplace (Prevention, Prohibition and Redress) Act, 2013 (POSH Act)?
Under the POSH act, the described action is unlikely to be considered sexual harassment.