While you might not get the exact same numbers (^1), you can get a very similar result in your browser's devtools, in the network tab, by doing a clean reload of the page. It will give you a total (both compressed/transferred bytes, and uncompressed).
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(^1) If the page, as HN does, has some headers or additional content for logged in visitors, the numbers will generally be a bit different. But the difference will usually be small.
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