When China buys from someone else (Brazil - nobody else has significant soy bean surplus) that means whoever was buying from that someone else now needs to go to the US.

The US also uses a lot of soy beans internally. Prices are down, but farmers are still selling soybeans and with careful management are making money.

I don't think international trade is so stable that any shift would imply equal and opposite shifts in trade. For example it looks like Brazil's production is up 5% while China's overall usage may be down 6%.

Soybeans are a pretty stellar food for protein per calorie.

And to stop misinformation in its tracks:

> A March 2021 meta-analysis published in Reproductive Toxicology concluded that neither soy protein nor isoflavone intake significantly affects reproductive hormone levels in men. Analyzing data from 41 studies and 1,753 participants, the researchers found no statistically significant effects on testosterone or estrogen regardless of intake dose or duration.

so Gemini says, link - https://pubmed.ncbi.nlm.nih.gov/33383165/