Idk
the english translation is hard to convey but ikasu mean they're kinda cool, fashionable. so it's talking about they (the couple) have that good look of a perfect (cool, fashionable) couple (sweet, lovely, smiley, heartwarming, bla bla) opposite to couple who dont look very happy, argue all the time, their hobbies doesnt fit. etc
thanks!
li’l addition: イカす is used in Splatoon for the equivalent of “Fresh!”
研究社 新和英大辞典 第5版
いかす2 ローマ字
be (pretty) good; be great; be smart; *《口》 be cute; be neat; 《口》 be groovy; be funky.
►あの俳優, ちょっといかすね. Not a bad-looking actor! | That actor―cute isn't he?
・その髪型, あんまりいかさないな. That hairdo doesn't look so ┏good [great]. | That hairdo doesn't do much for you.
Can this word mean "lovely" or "cute"?
While playing a video game, the character said "イカしたカップル", and it was subtitled as "...sweet and lovely couples..."
I never saw anything related to being "lovely" or "cute" while searching this word, most of the time is used as something stylish and cool