No one is attacking your “factual and informative” comment.
No one is disputing the difficulties you’ve highlighted. What is being disputed is your assertion that those difficulties are relevant to your assertion that China won’t be able to achieve this.
And the subject of the conversation is a technology that humans have already developed and is in use. So what is it about China/the PRC that would cause you to assert they are incapable of building/employing this technology?
Your argument is that “Hard science doesn’t care about politics,” so I assume you don’t want to imply that you’re critiquing the capabilities of China’s political system. So what’s left? Is it racism? The removed can’t achieve what other humans have already proven is possible because the removed is subhuman?
You are making a political statement whether you intend to or not, you don’t just get to whine about how you were only talking about the science and why is everyone being so mean when you only started a discussion about the science to reinforce (or deflect from) your original assertion.
What else would learning R mean? The programming language?