> aren't the identifiers in ENV{PRODUCT} already idVendor/idProduct?

I don't know the details. From what I gather from the upstream source
code, this device has a special rule to appear like this in the udev
file:

Drivers/Braille/Baum/braille.c:

    { /* NLS eReader Zoomax (20 cells) */
      .vendor=0X1A86, .product=0X7523,
      .parentVendor=0X1A40, .parentProduct=0X0101,

Perhaps something like 1A86/7523 plugged on 1A40/0101. That being said
it seems like both are generic ids, and the combination of them is not
really specific to Baum devices, since one could very well plug a
QinHeng Electronics HL-340 USB-Serial adapter on a Terminus Technology
Inc. 4-Port HUB.

I have opened the question on
https://brltty.app/pipermail/brltty/2024-November/020445.html

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https://bugs.launchpad.net/bugs/1958224

Title:
  brltty claiming cp210x devices on 22.04

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