That’s something I noticed too. I noticed the staff did not look happy to work there, but since I know exactly what to order everytime I go there, it goes smooth.
There is also an Imma Israeli restaurant in Kaohsiung near the love River in the Zuoying district, been there, great food, actual Israeli boys cooking, authentic inside as well.
If it’s being run by Taiwanese, then I wouldn’t put too much faith in the food and service. Not to say that Israelis are know for the good customer service, but at least the food will (most likely) be good.
I’ve eaten at Sababas in Taipei several times and the food was crap. The staff had no idea how to prepare it properly. It would be like me opening up a traditional Taiwanese restaurant abroad. Nothing would taste right.