Not even close. Combining all those brands results in a 13.5% market share.
Its also quite likely that the big grocery merger won't happen as planned for that reason.
https://www.axios.com/local/seattle/2023/04/24/seattle-favor...
These figures seem to be for the Seattle metro rather than the city itself. Costco might be a competitor in some sense but it doesn't serve the area I live -- the nearest one is a 45 minute drive away. WinCos are even further away -- they serve some of the suburbs, but not the city of Seattle. Ditto Walmart. I've never heard of or seen Campeon. Whole Foods / PCC exist, but are expensive. Trader Joe's is fine but not really a full grocery store.
... Amazon