You ran into a bug in some web software. It happens. Sounds like it was already fixed.
Meanwhile, the above blog post is a pretty amazing technical breakdown that is extremely detailed and well constructed. To reduce the entire company down to "a joke" because you ran into a bug once is just rude and dismissive. You might even agree because you changed your comment, although you still found a way to insult the blog post and the author.
And no, I don't work for Hellosign. I'm just a software engineer with some empathy for the hard work that has clearly gone into this. This is great knowledge sharing. Time and place.