This is a strange take. In Japanese it’s literally a consonant cluster [ts], which is to say it’s literally a Japanese “t” followed by a Japanese “s”. The Japanese “t” and “s” are not exactly the same as English, but they’re close enough, and English has the same cluster in, say, the plural “mats” of “mat”.
What “tsunami” breaks in English is not really the sound, but instead just the fact that English doesn’t allow [ts] unless it’s preceeded by a vowel.
equivalent to a shonen manga’s plotline.
It’s funny you should say that as there is actually a loose anime adaptation, titled “Gankutsuou”.
Idk if you’re a native speaker or not, but as a native speaker of American English there is absolutely nothing wrong with this to me. You could put it in about 4 different places:
On Thursday the press freedom group Reporters Without Borders announced ____.
The press freedom group Reporters Without Borders on Thursday announced ____.
The press freedom group Reporters Without Borders announced on Thursday that ____.
The press freedom group Reporters Without Borders announced ____ on Thursday.
The first one typically has a comma after “Thursday”. The second one you could offset “on Thursday” with commas. The third one is at best really awkward without a “that” or a question word (who, what, where, why, how) and you could offset “on Thursday” with commas; you can also drop the “on”, in which case you can’t use commas. The last one is possible but could be ambiguous (it could be that “on Thursday” is part of their announcement).
Where are you getting this information? This “pull your cheeks together a bit” sounds completely out of left field to me.