I think I figure out the issue.

Here's what we want the bot to do:
Post a failure message if value is a text. This means the code is not 1 aka SVG_STATUS_CODE.SVG_OK or 0 aka SVG_STATUS_CODE.NO_SVG

Here's what the old check is:

(steps.err_message_reader.outputs.content != '0' || steps.err_message_reader.outputs.content != '1')

However, this would be interpreted differently by the script. If the error_message is 1, it will trip the first check. If the error_message is 0, it will trip the second cause OR operators check terms until one is true.

Pretty much, this is the wrong check. Using OR in human language is different than OR in computer and I forgot to "translate" it.

Here's the new check:

(steps.err_message_reader.outputs.content != '0' && steps.err_message_reader.outputs.content != '1')

This will ensure that only contents that don't match both 0 and 1 trigger the script.

This should work.