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Important: there is a reason that I didn't include deflicker into the HG-Workflow. I always recommend taking care of flicker when shooting. There are various ways to do so, for example shooting wide open, twisting the lens or using manual lenses. For more details see my EBook.
The reason why I don't recommend using Deflicker along with the HG workflow is, that LRTimelapse will have to deflicker each subsequence inbetween the adjustments separately. This might lead to unwanted residual brightness jumps. In the Expert settings you can define, whether you want deflicker to affect the 2*/3* keyframes or not. Both have advantages and disadvantages. In my experience combining deflicker with holy grail is not a good idea - but it depends from the sequence, so it might be worth just trying it.
A better alternative
A better way to do it would be to just use the HG workflow, and then export via LRTExport from Lightroom. Now you can load the intermediate JPG sequence (LRT_xxxx folder) into LRTimelapse (ignore the warning) and deflicker that sequence. That might give you better results.