WOW! I can not even say how disappointed I am in this thread. The total disregard for the effects your comments have on someones parnasa is astounding. Especially since they are completely false.
If you're genuinely curious than find out in a less public way. Also, who are you to say if the IKC is generally accepted, you live in your "bubble" and maybe it's not accepted there but in my "bubble" it's very accepted. This isn't Israel or America it's not as easy to make OU and name brand hechshers work.
To answer your curiousity, just like major hechshers in America, the main Rabbi associated with the hechsher doesn't visit every store every day. He has people working for him who can check up on the restaurants themselves. In this case it is the Chazzan of the shul, Jacopo Treves who is the Masgiach. It just so happens the "rabbi in Brooklyn" will be there next week but that is totally irrelevant.
This thread is literally what's wrong with the politics of Kashruth and Judaism in general. If you knew the man you were hurting you would be ashamed. He told me he would love to leave Florence to go to a city or country with a more vibrant Jewish community but he feels if he left there would be no where for Jews to get Kosher food and people might eat non-kosher, so he stays. That is the person you are doubting and hurting...
All my post was doing was quoting 2 data points as I see them:
1. The IKC is not generally accepted. I use the word "generally" to mean that it does not appear on the CRC or Kosherquest lists, the two most authoritative lists. I have never seen a Vaad or other Orthodox Kasharus agency publicly endorse it. It should be noted that many smaller Vaads are on those types of lists, and many agencies out of NYC appear.
2. Ruth's previously was not widely accepted. I personally spoke to many Rabbis, including a former Rabbi in a different Italian city, and it was not recommended. I'm sure people ate there, but again, I did not see it widely endorsed.
My comment was not intended to say whether people should or shouldn't eat there. Additionally, I think you'll find that on this forum, everyone roots for there to be as much Kosher food around the world as possible. I believe it is constructive feedback to acknowledge the relative 'weakness' of the current state, as perhaps it will enable the restaurant to seek a more mainstream option, much like the restaurants in Rome and Milan have done.
My intention was not to hurt or disparage anyone. I apologize if I was misunderstood.