Unfortunately JPR doesn't report the individual growth rates for discrete desktop and discrete notebook in their press release, although with combined growth rates of 35.6% and 10.1%, I would expect both of them to have grown.Ahh yes you are correct, one (total Desktop + APUs) is in the start of the article and has a decline -4% Y to Y and the other (Desktop + Laptop dGPUs only) is in the end of the article and has an increase of 10.1% Y to Y.
But I was only talking about Desktop dGPUs the entire time (Mercury).
Mercury also reported that discrete desktop and discrete notebook GPUs were both up year on year. Their press release unfortunately doesn't contain any numbers except for the discrete desktop quarter on quarter growth which was nearly 40% (compare this to the 35.6% combined desktop and notebook growth JPR reported). Furthermore Mercury reports that the discrete desktop market has been growing year on year for the last 3 quarters in a row.
Based on both the numbers from JPR and Mercury, it's safe to say that the discrete desktop market has not been in a decline as of recently.