I guess we will have to wait and see. And, in my opinion, the ? is not if they 'lied', but how one interprets their marketing. False advertising is illegal in the US; both State & Federal.Well, that's what they said in their announcements, but I don't know their way of doing business. Have they lied in the past, that you doubt it?
It appears that PL8 will not be upgraded to include PR5's new denoising controls. See the link below first and then read about PR5.
Check this out for PL8..notice that it does not and will not include PR5's DeepPrime 3 and Fuji X-Trans '3'.

What's new in DxO PhotoLab 8? - DxO
New features include unbelievable noise reduction and detail extraction, live denoising previews, Hue Range Masks, and the best Tone Curve tool on the market