You've contradicted yourself several times in your posts and troubleshooting. Without doing all testing systematically you cannot expect Securifi to attempt to replicate your issue as you are saying it's one specific model of an Apple laptop, and that's a limited use case scenario. This is a public-beta product and if you are unwilling to properly troubleshoot you cannot expect support.
I do not work for Securifi, nor do I have any soft of affiliation to them, but your troubleshooting makes me cringe because I have to deal with this sort of "proof" on a daily basis. Please diagram the options you tried, which bands you were connected on (wireless), or wired connectivity w/ connection details, and what the results were and then the community or Securifi can fill in the blanks where you are unwilling or unable to test.
Also you may wish to retest when the next build becomes available as there are issues with the 5gHz channel currently according to Securifi's own posts and admission, and this is supposed to be corrected with updated wireless drivers which should be present in this new build. Personally I'm crossing my fingers that this build is available very soon because it will likely fix some issues I'm having, and will add features that I desperately want to try. I can understand if you're frustrated with the product, as in some ways I am too, but refusing to troubleshoot properly and accusing Securifi will not get you very far at this point in the product's lifecycle.