-----BEGIN BITCOIN SIGNED MESSAGE-----
Maotezi on bitcointalk.org
Today is 12.10.2019
-----BEGIN BITCOIN SIGNATURE-----
Version: Bitcoin-qt (1.0)
Address: 3QJEwDMp2SMB62vkcdzSz7vt3g3kgJYXME
IPD1Ou00lIcVKce1ICGptnC/37MmD7ZHuSjGQZLAFQsuIq6J0SzLyNEnHTkT9BLUxZduBFJvUS+hLQ6LZ2XEPYo=
-----END BITCOIN SIGNATURE-----
Quoted... but I
COULD NOT verify it using
Trezor,
Electrum,
Mycelium or
the jhoenicke version of BrainwalletX verifier...

You have messed something up... possibly extra/missing whitespace in your message. What wallet did you use to create this message?

no-bot
the problem is with his messages and his wallet about how it defines the "new lines". normally new line is defined as being "\r\n" which is what all those tools use but his wallet (Mycellium) is defining new line as a "\n" and if you replace the new line with that the message could be successfully verified.
this would be the hex of his message:
4d616f74657a69206f6e20626974636f696e74616c6b2e6f72670a546f6461792069732031322e31302e323031390a