The businesses in the other countries are, you know, businesses. Even if it were Chinese companies that were paying the tariffs, that will be baked into the cost of the good.
This is literally first-day economics. No such thing as a free lunch. The cost of the item that the end user pays should reflect all costs associated with production and distribution to that end user.
I have no idea how the fuck the rumor that these tariffs will be “paid by other countries” started. If there are suspicions that the tariffs are temporary then they might be willing to eat the cost temporarily so it’s not passed onto the consumer immediately, but that’s inherently temporary and not sustainable especially if it would make it so these companies are losing money.