I think most of us where under the impression that all Huawei cabinets where activated with G.INP...
It would be a fair guess that the problems with ECI modems has halted the G.INP rollout.
No more than a guess, mind, but the A&A reports suggest the issue has gone high in BT.
I'm not sure on the compatibility of the 8800AXL, I remember someone having some compatibility issues over on the Plusnet forum's but not sure of the outcome on that one.
I have an 8800NL with G.INP activated, working with Plusnet.
As @Ignition noted, DLM is far more eager to turn on G.INP than it was the old-style FEC/interleaving.
On an old line, I'd have 600 ES's per day (from 6,000 CRC's) which wouldn't trouble DLM. On my current line, I was getting just 60 ES's per day, but G.INP was still turned on.
that the DLM might be increasing your SNR to increase stability
It's a chicken/egg thing, but ...
On FTTC, DLM doesn't alter the target SNRM. Beyond the use of FEC/interleaving (old-style) or G.INP (combined with minimal FEC/interleaving, new-style), DLM's only other weapon is to use banding - or artificially limiting the speed.
Banding is, however, likely to cause an increase in the actual SNRM.
I think there are some technical advantages to do it this way around - probably in the way in which power settings vary, so reducing the potential for crosstalk.