I bought my ZMatter module back in Sept. 2022 - it reports as Z-Wave Module 21100 in the IoX admin console - does it support Z-Wave Long Range?  or is there a newer version that I would have to purchase to get that capability?  Is there a significant benefit to long range for indoor use in a larger 2 story house?

The zmatter module is supposed to support Zwave LR. However, when installing a zwave LR device I was never givren the option to use either LR or Mesh, so I believe they installed as mesh.

Zwave LR by-passes the zwave mesh network and communicates directly with the Zwave controller and has a longer range than a non LR device

Here's an article explaining LR

All About Z-Wave Long Range - The Smartest House

 

 

 

After reading that and noting that Zooz is now selling Zwave 800 series (=LR?) products - is it possible that UD is using confusing terminology and that the ZMatter is not a Zwave 800 series LR device?

From the UD website (see below) - note that it only mentions Zwave 700 series with possibly higher power?

Z-Wave+ (Long Range)

Enhanced Range

Start enjoying the enhanced range afforded by high caliber external antennas (on the sides) in conjunction with SiLab’s 700 series Z-Wave and Zigbee/Matter radios.

The Zwave/Matter module supports up to the 700 series. It's supposed to support LR but I'm not sure if it has been implemented.