You're absolutely correct when you say that there's been an effort on the part of progressives and self-proclaimed anti-racists to redefine racism. I don't see this as a positive development, though. Here's why.

Not only is the alternative definition being used to vilify a specific racial group, which in itself is, well, racist; it's also used to justify the dogmatic concept of "white privilege", which is basically a kind of original sin, something you're born with and can't ever get rid of, no matter how much you repent; it also erases the experience of white victims of racially motivated crime, and gives black people moral impunity for those crimes; "systemic racism" is also vaguer than individual racism, which makes it more difficult to talk about in objective terms, and ensures that the identity of the person who's talking matters more than whether his argument makes any sense at all.

It seems quite obvious to me that the people advocating for this pernicious definition are doing so purely out of selfishness and self-interest (in the case of black people) or guilt and ideological conviction (in the case of white people). People who are actually anti-racist should reject it as a step backwards for healthy relationships between the various races.