Is it necessary to write an element and a modifier together in a class according to BEM?

Question

css

Hello! Help to clarify the issue of BEM.
I watched a lesson with this example: https://jsfiddle.net/neizerth/z7eycmLy/7/
The author writes a modifier along with the main style. Here's an example:

I kept thinking that it's enough to write a modifier for an element. Is this notation correct?

Answer 1

And this is the right way. This is even in the BEM FAQ
https://ru.bem.info/methodology/faq/#%D0%9F%D0%BE%...