The comment had nothing to do with forming thoughts, but instead how thoughts can be meaningfully conveyed. If the mention of a minority or Native American technique in the analogy makes you close your mind before being able to understand:

Telegrams are insufficiently complex to express ideas on the nature of existence, and even if they were not, a frontier philosopher would run short of either money or time long before he reached his second axiom. You cannot use telegrams to do philosophy. Its form excludes the content.