I think he probably said that because some girls will think they can't get a date because they think they aren't attractive/appealing physically. I think some girls need to be reminded how beautiful they are. Emphasis on SOME girls tho.
A lot of times it's personality and attitude but dudes say that sometimes to remind the girl that
her looks are good and they would definitely sleep with her but it's something else that makes her unappealing/uninteresting to date and offer companionship in terms of the whole package including looks/personality/attitude/career/etc.
While guys do place a lot more emphasis on looks than women usually, there are other things that we like that can make up for it. I knew attractive women who I had no problems with physically but had poor attitudes, stuck up, mean to everyone, boring, slutty, no ethics, high maintenance, judgemental, lazy, too religious, debbie downer, narcissistic, negative attitude, poor self esteem, etc and their looks wasn't good enough to make up the character flaws/differences. I knew girls that weren't the best looking but had guys crawling up their legs because they had an amazing personality, were unique in a good way and the whole package was amazing. They were truly special and offered something the other girls couldn't which had guys fighting over them despite the fact that there were better looking women to date.
Sometimes the girl is perfectly fine but the guys she's around aren't good for her and she had to expand her social circle. Sometimes the competition is rough. I knew girls that were a 7 and single but were surrounded by 9 level women that offered more to men. There was nothing wrong with the 7 but she had rough competition in the dating market. She could either fix something to make herself a 9 to be competitive with the women or take her goods and service elsewhere. Then there are girls that aren't in the right zone to run a successful dating life. It's why there's not an outdoor water park in the middle of someplace that is always cold and snowing all the time. They take their business where it can thrive. Business 101.
Then there are some girls that wanted to date a model but they didn't want to put in the work to do it in terms of weight, attitude, wifability, personality, charm, skills, interests, etc but didn't feel like "settling" for what they could actually get at the moment. They will often be Rosie O'Donnell in terms of the whole package looking for Ryan Gosling/George Clooney thinking she deserves absolutely nothing less. They get fustrated about being single and then they wonder why they are dateless well into their 40s because they were too stubborn to compromise to market themselves in the dating world to attract potential suitors.