Yes indeed. All means all within a context. But various groups want all to mean this and that. It is not just the JWs. There are many others. Calvinists have been busy telling us that all or the world means a few.
When it says all things were created in Christ (Colossians 1.16) and the statement is attacked, we must ask who do you think was not created? Then the JWs can start looking for evidence for any teaching of a created a god that created all [other] things. When it says all things reconciled in Christ (Colossians 1:20), we must ask if the few of the narrow path of Matthew 7:13 are spoken of here. No. Some other group is spoken of.
I sense the reason they add [other] in John 1.3 and Colossians 1:16 is to emphasis low Arianism. In high / semi Arianism Jesus is not "a god" and he is not on par with other creatures. Here they wanted to emphasize that this a god was a creature not to be worshipped. But you can wonder why they felt the need to add others and at the same time later produce a paper like this?
Most of the watchtower quoted verses are taken out of their context. We would use language in the same way today. “Everybody” came to the show. If you want to use the same criteria for creation and salvation be my guest. Matt 10:22 “you will be hated by everyone” must be limited to those the believer came across and in general the Christians were hated. But the context shows exceptions to “everyone”, namely the one being spoken to. Genesis 3:20? Genesis 3:15. Context. Creation is sustained through Christ (again, Colossians 1:16-20).
Context is the big problem in JW religion. They say a lot and then they quote some verses that seem to support the thought. But context of the Bible passages is often ignored.