Youdontsay, of course I know the difference between the two seforim. And of course Derech Emunah is a completely different caliber if a sefer. However, I am not aware of anywhere in Derech Emunah where techeiles is discussed.
My point was that although there are many seforim printed with teshuvas from Reb Chaim, I understand that not all of them are very reliable. I have at least 20 of them in my collection, and many can nit be relied on.
Daas Noteh however is a much more reliable sefer. Especially because Reb Chaim gave him access to his personal notes of hanhagos of the Chazon Ish, and spent a lot of time with his son who authored the sefer explaining to him a great detail many of his opinions.
When Daas Noteh brings kisvei yad and teshuvas from Reb Chaim, it is very reliable. On this issue, it seems like he was trying to get Reb Chaim to agree that at least there is nothing wrong with wearing techeiles just in case, but Reb Chaim strongly opposed.
The commentator here FakeMaven is bordering on kefira. To say that if any Rishon holds there is no techeiles nowadays should “wrap it up”, is heresy. We don’t talk about Rishonim in that tone. And the agenda of such a writer is obviously not coming from Yiras Shomayim. And the way he talks about the majority of Gedolim who are on the opposing side is extremely disrespectful.
Some of the comments posted here are real kefira and should be deleted from any frum forum.