Your dismissive "banning the language a long time ago" is also simplistic to say the least. Among other things, his ancestors would have been beaten for speaking it, you think the effect of that has just dissipated into thin air, just because the government of Wales (established 1999) is now saying nice things about the language? It will take a long time to correct such a deep injustice.
I know there were horrific atrocities committed in the past wrt banning/subverting people's natural ethnic language; but I still don't see how people can cling to this nowadays, as their reason why they are proudly Welsh but don't speak any Welsh, when it is so easy to learn Welsh if you truly want to - there are no modern-day English people stopping you from doing so.
I'm English, but I went to university in Wales, nearly 30 years ago, and I learnt some Welsh in the freely-available classes. These days, of course, there is a host of online resources for learning Welsh, so you don't even need to be located anywhere in or near Wales.
I didn't keep it up when I left Wales and returned to England, because I had other priorities. I still remember most of what I learned and consider it an asset to my learning; I'm very glad I did it.
You have to be honest and acknowledge that, if any Welsh person nowadays doesn't speak any Welsh and has never made any effort to learn it, it's simply because they don't want to and it just isn't important to them. Entirely their choice, of course, although I personally find it a bit sad. Just like Facebook and TikTok are not important to me; but if they were and I still didn't use them or know how to, the only person that would be down to is me; they're freely available to me, wherever I am, and there would be nothing and nobody stopping me from becoming a proficient, prolific user if I only cared enough to do so.
Also, do Welsh people today really still cling to the historical fact of having been colonialised by the English? Historical perspectives differ as to whether it was an actual act of colonialist takeover or a willing partnership; but even if we fully assume the former, what is the point in holding on to it centuries later? How does it actually help you in your daily life and happiness to continue to identify as victims, having once been subdued by a colonial enemy? I'm English, but from 'peasant' heritage, so my distant ancestors were probably subdued by the rich and powerful too; I don't blame their great-great-great-great-great-great-great-great-great grandchildren for their actions now - whatever would be the point of that?
How come there hasn't even been a serious unified request for a referendum on Wales leaving the UK in modern times? It can't be that bad being associated with the English, then, if there's no real appetite to leave - as could the Scottish freely have done nearly a decade ago, if the majority had wanted it.
By all means be proud of your identity associated with your own home nation, but do you really, truly see the Welsh as such a completely hugely different culture from the English? Really?