SL's inventiveness is beyond reproach but he lived in a time (died 2006) rather later than Mr (I have 50 spelings of my name) Shakesper. Lem spoke several languages and a cursory glance at your link seems to show a lot of drinks!
Shake a spear did invent a huge number of English words. Some of them were due to the rather random speling existent in the Elizabethan England of the 14th C. The rest were the result of a creative mind that needed to deploy ideas and concepts in ways that were not available at the time. The clever thing is that he created many words that seem so obvious in meaning - and are so obviously "English". He literally understood English to its core and was able to manipulate it effectively. Good skills that man.