I admit my comment was not very clear as to my meaning. Terrible, now I read it. Indeed, the tables/i-pads are entered with altitude/QNH corrections and OAT. There will be latent calculations lurking in the backgrounds to take care of density. What I meant to say is that I had not seen a calculation where we had to make an adjustment to Vspds, directly, to account for density altitude. Of course it is inherent in the outcome of whatever method is used to calculate allowed weight & thrust & speeds.
Apologies for the confusion.