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Why would they call these the largest when things like this [0] exist? It's my understanding that even these large cells aren't the largest.

[0] https://www.australiangeographic.com.au/blogs/creatura-blog/...

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That’s an eukaryotic alga, not a bacterium.

Perhaps I am misinformed but I was taught bacteria come in both prokaryotic and eukaryotic varieties. Are algae not bacteria?

Bacteria are always prokaryotes since they lack nucleus and membrane-bound organelles. Algae (both single-celled and multicellular ones) are more complex and thus eukaryotic. That being said, photosynthetic bacteria (cyanobacteria) do exist and were known as “blue-green algae” in the past, but that term has fallen out of use.

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