There is no way you'll know the difference between AI and human dealers, they'll all respond the same way except you are told whether it's AI or not, but the problem I'm seeing with companies especially casino ones are the steps taking by their managers to replace human based jobs with AI, it's frustrating someone who had thought of securing a job forever to go broke home. It's unfair.
Maybe a new gambler that's new to gambling will be tricked into thinking that AI dealers are the same as humans but there is always going to be some differences in their manner of speaking. Even foreigners that can not speak English very well would not speak like AI, that is why it is very easy to know when you are dealing with an AI. AI lack emotions like humans and that's why they are robot. The reason why AI dealers are becoming more popular is because casinos are looking for a way to reduce cost. Do not be angry at AI if they are taking your job and do not be entitled to a job because no job last forever but instead use the opportunity to increase your skill and chances of getting another job.
I wonder why anyone would think that it will be difficult to spot an AI dealer when we see one. Now that AI is gradually taking over, I have seen movies made with AI, music sung with AI, dance steps enabled by AI, AI voice-overs, and many other things done with AI. No matter how perfect they try to make it, there are still ways to know that it was AI.
I personally have not had the experience of seeing how AI dealers carry out their jobs, whether they are doing better than humans, whether there is no difference, or whether the differences are very obvious and clear. However, nothing beats natural human interaction with gamblers. I will always prefer humans to AI.