As the Microsoft Liaison said "We know Software, we don't know how to build a Night Vision Device". The delays were COVID related and getting Digital Night Vision to hit it's marks. That's the "New approach to Night Vision" reference.

"That’s a delay from their initial fielding planned for late 2021 and a subsequent deadline of September 2022. Delays were needed, officials said, to work out new ways to approach night vision quality while also having the advanced mixed reality features crucial to the goggle’s success."

https://www.armytimes.com/news/your-army/2022/12/26/close-combat-mixed-reality-goggle-fielding-in-2023/