OP, take the college’s word on what they do for super scoring, they really have no reason to lie to you.
For example, from their websites:
Yale: Superscoring: When assessing SAT results, admissions officers will focus on your highest individual section scores from all test dates. For example, if you took the SAT twice, your highest Evidence-Based Reading and Writing, Math, and Essay scores will be considered individually. When assessing ACT results, admissions officers focus on the highest ACT Composite and highest Writing score from all test dates, and also consider individual ACT subscores.
UChicago: Yes, we superscore both the SAT and ACT. If you take the test multiple times, we will take your highest individual sub-section scores and combine them to give you the highest overall score possible. For example, let’s say you submitted SAT scores from a June test, and they were 600 critical reading (CR) and 700 math (M). Later, you submitted SAT scores from a November test, and they were 700 CR and 600 M. We would consider your overall score to be 1400 (700 CR and 700 M).
Stanford: We want you to have the best test representation possible, and we will superscore your results according to the following rubric: For the SAT, we will focus on the highest individual Evidence-Based Reading and Writing, Math, and Essay scores from all test sittings. For SAT exams taken prior to March 2016, we will focus on the highest Critical Reading, Math and Writing scores. Because we are not able to superscore across the two exams, we will superscore results within the old and new SAT exams separately. For the ACT, we will review all subscores and will focus on the highest Composite and the highest English and writing scores from all test sittings.
Columbia: If you take an exam more than once, you will be evaluated on the highest score you received in any individual section. Please note that if you are applying for Fall 2018 admission, we will accept scores from both the redesigned SAT and the previous SAT; however, we will consider only the highest testing results reported from one version of the test, not across both versions.
…and so on, as you can note they ONLY CONSIDER/FOCUS on the highest scores, or you can believe whatever random poster on CC says or maybe what the university PUTS IN PRINT on THEIR WEBSITES…