Your looking at a power consumption of roughly 515W for your build. That's around 80% of the capacity of your current PSU. On paper that's fine and it is a good quality unit. I think the reason people are advising it's not enough is probably due to transient spikes. In a nutshell although the GPU uses 220W, there may be times where for a fraction of a second it uses substantially more than that. For example an Nvidia 3080 uses 320W, however there are moments where it could pull over 500W. Here's an example:
That has a peak power of 489W despite being a 320W card, I believe in some of Seasonic's testing they got the 3080 to use over 500W in certain scenarios.
If there is not sufficient excess capacity on the PSU then these momentary spikes could trigger the over current protection on the PSU and the PC would cut out.
Gamers Nexus had a good video on transient spikes:
View: https://www.youtube.com/watch?v=wnRyyCsuHFQ
This was a significant problem on the 3080 and 3090. How much of a problem it would be for the 6700 XT in your particular context I'm not sure.
The recommended minimum by AMD is 650W for the 6700XT, however not all 650W PSU's were created equal and yours is one of the higher quality ones.
Going by anecdotal evidence I see many people with the 6700 XT and similar specs and PSU capacities not having an issue.