I would think any direct impact would be quite small, as the products are all aimed at substituting for cow products now, and cows are basically a rounding error in the number of farmed animals. It seems like the main impact of Beyond Meat is to drive the plant-based industry further and to establish itself to be able to produce higher-impact replacements down the line.
Interesting question.
Ever so rough fermi: Beyond's revenue was around $100 million - they sell their products at $1 and save an animal for every 100 products sold, then they save 1 million animals a year. Increasing their revenue by 1% through a grant or unpaid internship would save 10k animals.
But if the market is efficient, the counterfactual impact of for-profit clean meat companies is converging towards zero.
More basic clean meat R&D might be more undersupplied by the market.