-von isn't a canon suffix, and was replaced with -taas because -taas is closer to canon. -von originally derived from sindugahvon "unyielding." However, the word for "yield" is gahvon, so the interpretation of -von as "-ing" is incorrect.

-taas comes from viintaas "shining," related to viin "shine."

Ah, thank you muchly for explaining that. Is their a new edition of the Learning Dovahzul.pdf that doesn't have the suffix -Von listed as a Canon suffix?

There is not currently. The Learn pages have all the up to date information.

Ah! Thank you, I will be studying that then :)