To be honest, Janine, "Marxistish" would also be inaccurate, since what they promote is Marxist in name only, because it is utterly unlike and in fact anathema to the system that Marx and Engels actually formulated.
I am also indeed aware that BLM espouses "Marxism" on their website, but again, that is hi-jacking the name to look good to progressives, as what they promote as "Marxism" bears no resemblance to the system discussed in Marx and Engels' various works. In fact, we Classical Leftists have a word for people on the Left who support any type of system that happens to have the words "socialism" or "Marxism" etc attached to it, no matter how much it deviates from the economic democracy described in THE COMMUNIST MANIFESTO et al: we call them "tankies."
Conservatives also jump on that misapplication of the name, of course -- not to attract progressives to it but in their case to denigrate the work of Marx and Engels in the eyes of everyone by making people think of a system of autocratic despotism whenever they hear or read "Marx" or "Marxism". One thing Marx and Engels never did was race-bait or gender-bait, and they stuck firmly with class unity while simply saying that such a system would benefit people of color and women, who during that era were truly oppressed.
To be clear, I never denied that BLM and many other purported liberals and Leftists, not to mention other tendencies, use the words "Marxist" and "Marxism." However, saying that makes it Marxism in the classical sense as described by Marx and Engels is like arguing that referring to an ostrich as a duck makes it a duck, since that is the word people were using for it. The people in charge of BLM are very well aware that they will attract lots of tankies to their cause simply by using the words "Marxist" or "Marxism."