When Discourse sends emails on particular topic, posts tend to miss the link that points back to the website. Gmail for example shows the posts one after the other. It looks great, but the part where you need to click to respond gets trimmed (duplicate content) with … dots. Invisible link is not best solution if you are trying to convert readers to users.
I do not see the behavior you describe in GMail on the web, for Discourse reply notifications. I have never seen the reply block get hidden as a signature. Can you post a screenshot? And what browser / os?
I think this may be a language specific issue. I don’t get that behavior (collapsing the reply footer) in GMail for Discourse notifications in English – and I have never seen it once!
Are there any overlaps with those words and traditional names in that language? E.g. “John”? The Stack Overflow topic you cited implies that names are used as triggers for signature collapse behavior.