I'll eat my hat, that it is not AY Golds flooding the lounge but non-AY OWS status holders.
3 HEL-LHR departures in the afternoon (AY+BA) and a few longhauls definitely have 3-4 times OWS than AY Golds. Statistics not available of course, but AY definitely has it since they are paying for the lounge visits.

This Premium lounge access for OWS is not required by OW and to stay loyal to their own customers and to offer even a small extra perk to AY Golds they should just kick out the OWS clientele until more acreage is available. The AY+ program renewal did not create more value to AY Golds, besides the marginally lowered tier limit, and now they are more or less devalueing it with their own actions.