It's impressive it got as close as it did with estimates (and that it can actually do basic math now). Yet then it goes "let's do a precise check using tools" and just blatantly makes the whole thing up. Comedic but also worrisome.
I find the entire sequence pretty weird. It's such a bizarre mix of competence with blatant incompetence that borders on deceit.
The difference between Gemma and Qwen here is that Qwen followed a much more detailed process - it consider leap years and seconds in its calculations (where Gemma used estimates like "roughly x years")