There were subsequent studies by many other doctors and enthusiasts.

The most recent data showed in those studies (sorry i need to look up source and say only from memory what I’ve read) - the weight drops indeed at the time of the death but in a much smaller order of magnitude.

21 grams was never proven. It’s way way too much. There were bug error margines in the mechanical bed centuries ago.

The light was not detected in recent studies.

The electro magnetic changes were detected along with brain activity even after death. Including electro magnetic activity after death. But supposedly powered by chemical reactions of decaying body.

Another small point to mention is that while numbers 3 and 7 are considered important in the Bible and numerology and many occult teachings, it is not related to the 21 grams because at the time of the writing the Bible, nobody was using “grams”, therefore whatever number 21 represents in grams never had any meaning in whatever other units that were used at that time.