sigh
iii) they aren't equivalent to tier 1 in England
iv) you did
v) no, I didn't - as said above there isn't a lockdown coming, and what I said was that people from England were coming to Wales to shop and thereby spread disease (which is true, at least based on the police patrols that were sent out to stop people (edit) and the reports of people doing it)
vi) I suggest you read Wales Online more closely, as well as a map. Wales is a very geographically divided place, we don't (because of the lack of transport links and the terrain) tend to travel between north and south anything near as much as we do between west and east - so the comparison needs to be split between North and South. In the North, since the lockdown was lifted the counties with the highest rates of infection per 100000 are Wrexham (626) and Flintshire (608), with the counties further west less affected (Denbighshire 227, Conwy 127, Gwynedd 129, Anglesey 99). The South is slightly different because although the big cities aren't on the border, they are (thanks to rail and the M4) easier to reach from England than many places closer to the border, with Cardiff (2028) and Swansea (1960) higher than Newport (1190) or Monmouth (445). Pandemic disease generally spreads along transport links (and ease of access), and what we see from this is what we'd expect to see; the places that are easiest to get to are the hardest hit (at least since lockdown).
vii) with respect, I trust SAGE far more than I trust you - they've at least been right on this subject
As for the rest of your post, I think you are replying to a point that wasn't made. The English tier system wasn't mentioned; what I said was that he should have took advice rather than ignoring it in the hope it went away.