It will depend on (a) the state [upgrade status] of your phone and (b) the version of GApps.

If you have both a phone and GApps of similar vintage (similar/compatible release dates, etc.) which were developed and released before this imposition was forced upon Google then it should update.

The way I read that document is that code generated from now on will test the hardware and if it's found to be incompatible with the directive then it will not install. Simply, I read this statement to mean that for the foreseeable future you will not be able to sideload current or newer release of GApps onto Huawei phones.

The only true way to find out is to try it.

I'm not sure if the answer maybe got updated or not, but for me the text in bols clearly says that sideload will not be possible.

Says it will not work reliably.