Well, that is interesting - when I access that article through the link above, the phrase "not respond to that survey and delete it" occurs just once, in the passage I quoted in my original post, which does not contain the phrase fragment "if you would feel more comfortable, you can..." - in fact, this phrase does not occur at all.

Where are you getting your information from - is there a link to this correspondence, in the article or elsewhere?

Well, that's the point. We don't know the first half of the sentence.

You wrote, in what is a complete paragraph, '"Not respond to that survey and delete it" is also the ending of a sentence that begins "if you would feel more comfortable, you can".' [my emphasis.]

'Is also' has very different implications than 'could have been'.