BS”D
Yes, it is said that Rav Landa does know the formula for Coke. However, if it (along with whisky) has disappeared from chassune halls (and other Chassidim never drank it to begin with – they have Chaim’s Mayim and Ber’s Mayim) again, it is like the toiveling of plastic – take it or leave it but there has to be a reason for it.
If we were speaking of something healthy and necessary, I would probably go along with the 25% or so in my community who still do drink it – but as convenient as it is Coke is a harsh, abrasive drink that contains a chemical that I have used for removing rust from metal.
And if you have it around and decide to stop drinking it, you can always use it to clear your drain LOL.