How to correct frequent short pitch and speed variations working with Spectral Pitch display or...

This is still in the current release, and the procedure given in Stretch and Pitch (the bit you are interested in) is still present. I'm not surprised that the helpdesk couldn't find it because they aren't actual users and only have a cribsheet to work from. In the same breath though it has to be said that they cover the entire range of Adobe products, so it's understandable that they can't find everything...

This is a screen-grab of the process at work:

This is using the Preview editor to show what happens to the duration and pitch. The one difficulty you will have with this process for what you want to achieve is that it doesn't cope with gradual changes - you have to use it in sections of fixed change.

As an alternative you might like to try manual pitch correction, but this will only alter the pirch, not the duration. Assuming that what you need to compensate for is a pitch and duration issue (like wow), then ideally you need to vary both together, which you can only do in sections as shown above. Manual correction uses a rubber band and you can spline the curves to be smooth, but won't correct the time distortion. It looks like this:

iSotope's RX repair system has a wow compensator in it, and possibly you may get on better with that - but it's not an easy thing to fix, unfortunately. HTH.