That's not necessarily true (if it's from the Mossimo misses line or the Merona line it might be dressy enough).
But the link worked for me and no it is not dressy enough.
If you're shooting for Target, look for a dress with a black tag (instead of a pink or red one) - these are from the Misses line and are a little longer/more covered/more appropriate for preference night. I don't think the monthly line is dressy clothes this quarter.
Try everything at Target on - sometimes the fit is wrong or it'll be waaaaay short.