It depends a lot on what you want from the program.
If you are wondering how adcomms will see it, from their pov summer programs come in two main flavors: a small number of extremely competitive programs and a lot of programs that are mildly selective, like Oxbridge. The latter are seen as fancy summer camps for kids lucky enough to have parents who can afford them- and that’s fine, but they won’t give you an admissions bump on their own, regardless of the name of the university or the course. It can certainly be a part of a larger narrative about you, but that’s all you can count on from that pov.
On the other hand, if you are looking for a fun adventure, or if you have a passion for a subject then the summer academic programs can be super. My Ds all did at least one- one has friends from a program she did 6 years ago, as the students have continued to cross paths b/c of their interest in the subject; another had a great experience, but realized that she did not want to study that subject or at that university!
So, I’m not nay-saying them, but saying be clear what metric you are using to choose. I don’t know exactly which program you are talking about (there are several with very similar names), and I don’t know you or the program well enough to say whether it’s the right program for you. Most of the good programs are good at marketing- that is, making the program sound amazing- and the unis are so photogenic that is hard not to be wowed by being there. Teachers are variable anywhere- and even between students,