I am aware that you can only multiclass into a class that you have the required stats for (ex : dex 13 + wis 13 to multiclass into monk).
I am also aware that your initial class can be one that you wouldn't have the required stats to multiclass into in the first place (ex: start as a wizard with an INT of 12). You can continue to get levels in that initial class as long as you don't multiclass, but after that, you can't get additional levels in that starting class (unless you then meet the requirements).
However, someone recently told me that if you don't have the requirements for your initial class, you cannot multiclass at all (or in other words, you cannot multiclass out of your starting class if you don't meet its requirements). Is that true ?