I received a philppinense from Orchid Zone's denouement around 2020. It had been quite spectacular in bloom but by the time I got it it was struggling and quickly succumbed to something that looks like what you have. I pulled out all stops, soaking in bare-root in peroxide and then Physan solution, they repotted in bark and treated several times with KelPak. The tiny leafless nub left above the medium seemed to have some living turgidity and so I just treated it as a regular plant, watering with RO/K-Lite and treating with KelPak, baseially living on hope... 9 months later I thought I saw something greenish and over a few weeks a growth bud developed. I now have a 5-inch-wide growth of this plant. It was a compact form to begin with and is growing verrrry slowly but it did live, so far. Sharing this tale in hopes that it can be of help to you.