Probably my second favourite movie of all time!

All languages: Let's make sure our words for counting are short.
All languages: Yeah, that's a great idea!
Finnish: *knocked out by too much Koskenkorva*

Swedish 'u' and Japanese 'u' a very very close.
Which is why I'm sad that all Swedes think all foreign languages use German 'u'._.

Tom Scott made a short video about it:
https://youtu.be/s6kNR8Mj0ZE

So if we go back to the girl in the post, people who base their view in IRL or fanservice-free anime would certainly call her "huge" or maybe even "exploading", but for us oppai connoisseurs would probably classify her as 並乳 "normal-sized" or 美乳 "beautiful-sized".
So for some, Thunder Nyan Nyan is absolutely oppai loli, but for some absolutely not.
As for me, I didn't think I would be part of the community here when I registered just to browse some memes, so I just picked something I liked. In hindsight, probably not my brightest moment. But as no one has called me any hurtful names yet, I guess I'll keep it for the time being. (｀･ω･´)

When it comes to oppai, the situation is rather messy as well. First of all, what we outside call oppai loli, isn't called oppai loli in Japanese. The most common expression is ロリ巨乳 'rori kyonyuu' "loli huge b00bs".
Japanese is a language with less specificity than western languages, e.g. 足 'ashi' means both "leg" and "foot". In the same sense 巨乳 "huge" refers to both all kinds of big sizes, but also the smallest of the big sizes.
There common three-step scale is 巨乳 "huge" <　爆乳 "exploading"　< 超乳 "super". The latest category is almost exclusively used for >ridiculously< big sizes even for anime-standards. However if you compare what is considered "exploading" IRL it can be relatively smaller than the lower end of "huge" of 2D.
There was a tweet floating around Japanese twitter recently how people who liked small would classify what is "huge" and "exploading", versus how people who like huge classify "huge" and "exploading": it's all relative to what you're used to.