Was going to say the same. Also π isn't infinite. Far from it. it's not even bigger than 4. It's representation in the decimal system is just so that it can't be written there with a finite number of decimal places. But you could just write "π". It's short, concise and exact.
And by that definition 0.1 is also infinite... My computer can't write that with a finite amount of digits in base 2, which it uses internally.
So... I'm crying salty tears, too.
[Edit: And we don't even need transcendental numbers or other number systems. A third also doesn't have a representation. So again following the logic... you can divide a cake into 5 pieces, but never into 3?!]
I thought that was the joke in the comic? That we can't know numbers exactly that have an infinite decimal expansion. That'd be true for some rational numbers like a third, if you change the basis of the numeral system it'd be different numbers. And irrational numbers too if you have a integer base. But I'd argue how we write down a number isn't what determines exactness or 'infinity' by the words of the comic.
That doesnt make a difference. You can find the exact circumference of a circle, you just cant express it in the decimal system as a number (thats why we have a symbol for it so you can still express the exact value)