Yes, I understand the objections as a determined materialist must fight at all costs to dismiss this case. I believe I have heard Dr. Tart respond to these accusations with things like she would had to have removed the electrodes and that would have shown on the monitor.
But anyway, if the whole thing rested on just this one event, then we have a controversy. However, there's more as in this tip of the iceberg
article.
No doubt the materialists have no choice but to deny these things ever occurred as they appeared to have occurred and I am sure they have done that.
In the end we each have to ask ourselves who is being most professional and honest with the evidence. I know we fall on opposite sides of that coin.