[Manthink]

Singapore bak ku teh is totally different from Malaysia version. Although having same name.
Different taste, ingredients and cookery culture. So Malaysia's concern has nothing to do with Singapore. 
That's their internal affairs.

But then hor, SG already kenna drag into the Bolehland argument based on the OP's info...which cites a CNA documentary on Bah Ku Teh's origin and rise of Food "Nationalism"...

The debate occurred after Tebrau MP Jimmy Puah had urged the government to consider recognising it as a national heritage food. Puah’s motion in favour of bak kut teh was because he wanted to “protect and empower” the dish after a documentary suggested that it could have originated in Singapore.

BKT is "soooo Singaporean..."
https://youtu.be/Dc1RPhzA248