, but the fact still stands that tones in Pinyin are indicated by diacritica and not by numbers.

Sigh

Again...

Nobody is saying you use numbers instead of diacritica, they are saying numbers can be used if you are unable to use diacritica for whatever reason. And pinyin with numbers can be understood, better than pinyin without any indicator of tone.

How can you fail to comprehend this very simple premise?!