Yes but I would say this section is referring to non-radar area, hence the "as appropriate" and also as per section 8.5.1. even though one cannot really say it is crystal clear.
The locals do not utilise SLOP in that area. Only maybe when westbound and out of radar area as for them it is always a random route.
Iceland AIP wording is a little different:
ENR 1.8.11.7.1. section 5:
"Aircraft transiting oceanic radar areas may remain on their established offset positions."
Keyword here is transiting. Therefore I would say that for a flight to/from BIKF would not be appropriate to do a SLOP in that area and under radar.