Yes, Like telling newbies that dunk sparging is more effective simply because you think it is.
I suggested BIABrewer.info because they list a great deal of information on BIAB based on scientific experimentation, as they do with the sparge/no-sparge concept. I learn a lot here at HBT, but the other site offered more details on BIAB that are based on fact rather than opinion disguised as fact.
Homebrewtalk has a lot of expert advice, and a lot of opinion, as do all websites. I'm not knocking BIABrewer.info, and I used it years ago when geting into BIAB, before it was popular here. But BIABrewer.info doesn't have a lock on BIAB knowledge. There is great BIAB knowledge right here , you don't need to go elsewhere.
As for dunk sparge helping, yes it's a scientific fact that it does.
I used my refractometer to compare no sparge with dunk sparge, and did get a noticeble higher gravity with the dunk sparge. The more grain you use, the more you will benefit from teh dunk sparge.
Do you have to use a dunk sparge? Of course not. You will get a little less fermentable, and you may be satisfied with that.
I'm not, because a dunk sparge is so easy. Your wort is heating up anyway, and the dunk, stir, and bag raise take all of 5 minutes. I've found that the dunk sparge is very easy and increases my yield by a lot more than 1 pound of extra grain.
As a side note, while I haven't been active on BIABrewer.info for years, I have sitting in my inbox there a message from one of the experienced BIABErs, from 2012:
>.ArcLight, You are correct, that sparge on high gravity will help.
The general philosophy that many there have is make you brew day as simple as possible. No squeezing or dunk sparging, just use an extra pound of grain.