It has similarities but to be fair Plausible is also very close to the stock Tailwind UI components: https://tailwindui.com
Yes Plausible using tailwind and I'm using Bulma because I'm comfortable in it. I like plausible and I have chosen their design language for GAClient. And I don't think anything wrong with it. I'm not cloning Plausible but creating add-on for Google Analytics in the same design as Plausible.