This subject has been well covered before.
So, at the risk of repeating myself, there has always been Soul music played in Liverpool, more than anybody who didn't grow up in Liverpool will ever know, just not much Northern Soul, which is what we're REALLY talking about here, right?
As for it being a city influenced mainly by Funk, I've never heard so much twoddle.
I'm saying no more, because I don't want to get into any pointless arguments, I'll leave it up to others to rightly correct any misinformed rubbish that might be portrayed in later postings.
The Sink Soul Club was one of many clubs in Liverpool playing Soul music. But it was one of the earliest and one of the best, chronologically running in parallel with the likes of the Twisted Wheel, etc.