They CRISPR'd to cut out the correct spot, but instead of filling the gap with Delta32, which is known to help with HIV immunity, they replaced it with... random data it sounds like.

In other words, it sounds like every cell might have gotten it's own randomly selected garbage data... They seem to say only a single cell they measured got the correct mutation.

Telekinesis, rapid regeneration, blue hair

it would be really really hard to figure that out at this point, most likely. again, like the article says, they cant investigate the embryo too fully without "destroying it". Same sorta goes for a kid. But if the unintended mutations manifest in a bad expression, you might be able to start researching in situ in labs with cell cultures with and without the gene present / expressing.

this file apparently lists the variants in the embryos

http://www.chictr.org.cn/Ajax/Download.aspx?type=downloadfil...

some are marked as benign, some likely pathogenic