I think the problem lies in the interviewer in this case. This tool seems to be a substitute for being in an interview room and having a whiteboard to write code on in front of the interviewer, rather than an IDE with a "record-mode". As such, I think the interview question should be posed as if that were the case.
In regards to its effectiveness, I think if you take the above into consideration, this tool works very well as advertised. If I were being interviewed with it I suppose I'd just be thankful it has syntax highlighting.
Questions for this should be to discover a person's thinking and problem-solving style, not the correctness of syntax/libraries/etc. Things like writing idiomatic code, etc. are much more appropriate to test for.
In regards to its effectiveness, I think if you take the above into consideration, this tool works very well as advertised. If I were being interviewed with it I suppose I'd just be thankful it has syntax highlighting.
Questions for this should be to discover a person's thinking and problem-solving style, not the correctness of syntax/libraries/etc. Things like writing idiomatic code, etc. are much more appropriate to test for.