The Pricing and Valuation implies 300M shares. However there can be many classes of stock, both common and preferred that grant different rights and ownership. If they have different classes they could have a different number of shares, but the different share types are valued differently.
Shares are just objects granting different rights around the company within certain legal limits. (Ownership, Governance, Profit share, etc.) If you have agreement from the controlling body you can instantiate, remove, or restructure shares at any time. The point is that they could have decided with their bankers that 300M was a good number of shares to have at an IPO and decided to split or reverse split as part of the transaction. It has no bearing on the number of shares today or a year ago.