Kanji with long readings

[matt_in_mito]

閄ものかげからきゅうにとびだしてひとをおどろかせるときにはっするこえ

…

Bye

[Moyga]

I started reading about this because it was interesting and wikipedia says:
漢字の中で最も長い33文字の訓読みを持つ」と言われることがあるが、実際にはこれは訓読みではなく、漢和辞典の字義解説として掲載された例がある
So according to this, it isn’t actually a reading of this kanji? But then why did it become widely believed to be a reading? Weird.

[matt_in_mito]

That’s right, it’s not an official reading, I just thought it was hilarious.

[severian]

Getting real Llanfair­pwllgwyngyll­gogery­chwyrn­drobwll­llan­tysilio­gogo­goch vibes here.

[Asher]

This would trigger my ocd so bad if I saw it in a book with all that empty space between it and the following word.