I call BS.
I've just had a look myself and none of those images appear on the site.
Link:
http://i.imgur.com/5tABW97.png
I suppose they could have been hastily removed, however, there is also no source for this supposed Reddit thread. Also, on the BBUK subreddit there is no mention of these images.
Also, many of the images on the actual website don't appear in that list. I'd wager this is photoshopped.
Furthermore, I know from previous series that all housemates are given codenames. I have a Big Brother app, which uses data from that site, and even after housemates are revealed their images are all given codenames. For example, sweets, or cities. So Perez could be Paris while Katie was Kyoto, or whatever. I see no reason why they would A. change from that method this year, and B. also mess up and publish them all to the site.
One more thing; using that Inspect Element tool in Chrome will, to the best of my knowledge, inspect the website. In other words, it isn't going to show anything that isn't already there, and from looking at the screenshots its still the placeholders that are present on the website. Why would they upload these images and not use them on the site?
Oh, and the CBB lineup is never really final until launch night, so it would be silly of them to put them up anyway.