Command:
ssh -i '/home/daijwgmi/.ssh/trappist1_main_key' -o StrictHostKeyChecking=no 'python'@'192.64.115.78' "python3 '/home/python/echo_test.py'" 2>&1

Output:
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ED25519 key sent by the remote host is
SHA256:qDUFB/Wf8102QXzU6F33XCNYjOA2yOv35B35TPbZjzg.
Please contact your system administrator.
Add correct host key in /home/daijwgmi/.ssh/known_hosts to get rid of this message.
Offending ED25519 key in /home/daijwgmi/.ssh/known_hosts:4
Password authentication is disabled to avoid man-in-the-middle attacks.
Keyboard-interactive authentication is disabled to avoid man-in-the-middle attacks.
UpdateHostkeys is disabled because the host key is not trusted.
python@192.64.115.78: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).