“There is a verse missing. This is the definitive verse on the Trinity, and it is not in the ESV.”
That is because it shows up in no ancient manuscript of God’s word in any language I know of. But only starts to crop up in a few medieval ones around the 12th century or so and ended up in the RT through fraud. So it is spurious, put in to shore up the Trinity doctrine.
Sorry, your information is incorrect.
Please state your sources.