I think that's a bit of a hyperbolic example though. We're not talking about intricate skills here, we're talking about common, basic tasks being done more efficiently (and sometimes better). If I have 100 numbers to add up, I'm going to do it in a couple of minutes on a calculator or a computer rather than spend much longer doing it manually with more scope for error. That doesn't mean that I'm going to lose my ability to do it manually in a crisis. Likewise, if I have a task that I can do quicker and potentially better using AI, I'm going to use AI.
I recently wrote a long report and needed to finish it off by providing an executive summary, something that a year ago might have taken me an hour or so. Using Copilot, I generated one in seconds, then spent about 5 minutes checking it and making a couple of tweaks and ended up with a product that was arguably better than what I would have written from scratch, especially as I was having one of those 'thick head days'. There's lots of times I've been struggling to word something so have put my clumsy effort into ChatGPT and have thought 'yes, that's exactly what I was trying to say' at the output. None of those things erode my ability to write something myself should the need arise. Indeed, I'd argue that seeing how AI can re-parse what I've written can be a good learning opportunity.
It's also a great enabler. I manage a team of people across EMEA and despite English being the lingua franca of the company I work for, language skills vary between individuals and sometimes language weaknesses detract from the quality of what they produce. However, Copilot now means that work can be turned into good quality business English, which they have the language skills to review for accuracy even if they were unable to write it themselves in the first place. Plus, as several have mentioned, reviewing what AI produces from their input actually helps their language development. Even in a group of primary English speakers, you may have somebody who has great ideas but lacks the skills to communicate these well, but with AI that's something that can be overcome.