The part of the sentence 'the meaning of would not be able to make it today' is correct and usable in written English. You can use it when you are trying to express your regret at not being able to attend something or go somewhere that day. Example: I'm sorry, but I won't be able to make the meeting this afternoon; the meaning of would not be able to make it today is that I can't be there.
My body wouldn't be able to cope with another Olympics and I wouldn't be able to make it.
"Only the lazy would not be able to make money".
If he had stayed with the same technologies, he would not be able to make advances.
"This really does increase the number of observations that experts alone would not be able to make," said Dr Slawson.
Even a "reflexive governance" [4] would not be able to make sense of this extreme constellation.
Otherwise I would not be able to make films".
Last minute guest may not be able to make it.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK