Thanks, I don’t think so. The version in your link seems more luxurious, the rolls we ate used dried rice paper and more basic.
I think maybe it was pork rather than beef.
I do a bit checkup, looks like it could be Bì Cuón - Shredded Pork and Pork Skin Rice Paper Rolls
http://foodforfour.com/2010/07/bi-cuốn-shredded-pork-and-pork-skin-rice-paper-rolls/
http://123monngonmoingay.com/cach-lam-bi-cuon-don-gian-tai-nha-cho-cac-ban-tre-me-an-vat/
The thin strips on the first picture could be pork skin. (I was thinking it might be jelly fish) The powder they used, could be roasted rice powder, it was much darker than most recipes I find online.
