I had a Doritis pulcherrima var. champorensis that had all the leaves fall off and the plant tried to come back by growing a new shoot.
Then there's the case of a Phal lowii I have that had all but one leaf left but the roots were still alive. The roots were not actively growing either. This one now has three leaves after about a year.
So, in my opinion, unless everything is dead, your Phal hasn't thrown in the towel yet...
And I didn't do the sphag and bag thing on either one of the plants. Although the house is always at around 60% or 70% humidity.
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