Microsoft hasn't said anything like that. Unless Microsoft is going to now drop support of things without ever saying so, so until they do announce something I don't believe this.
Also if Harman/Kardon force installs Alexa or Google assistant on my Invoke I'll sue them. They can gift me an echo or Google Home speaker though, but if I wanted Amazon or Google in my house I already would. They can't completely change the product after purchase like that.