Without having more detail I can't speak with certainty, but, general principles of inventory management and cash flow discourage having a surplus of stock, as that ties up a significant amount of working capital in the costs of storing and handling it all - you risk not being able to pay your liabilities because you've sunk all your funds into inventory that hasn't yet sold and generated more revenue.

Companies often have longer term contracts with specific prices agreed that can't always be easily changed. Those contacts could quite easily become unprofitable if there are sudden increases to the direct costs of fulfilling them. So, rather than trying to fuck customers, this company is likely trying to stock-up at current market prices to ride-out the first year of tariffs, but in doing so, needs a large injection of working capital to cover the expenditure (hence cancelling bonuses), and also puts itself in a very vulnerable position where cash flow is concerned by tying up that capital in inventory - any further sudden and unexpected costs could lead to the business folding.