The tag issue is now resolved as the user who added it today has now removed it rather than give a reason for it or nominate a project as per the instructions at Template:Expert-subject which are quoted above. I'm sure the tag wasn't removed because I pointed out that it represents an admission that the article should not be deleted. 

 I was going to nominate the wikiportal Beer (WP:BEER) as that is where most brewing related expertise resides. But now that the user who has added the tag thinks the article is good enough to do without expert attention from there, we can count the issue has settled.