Liquidity doesn't begin to explain the valuation question. SoftBank's market cap was once 110bn vs their stake in Ali Baba at 150bn [0] . Even if you marked all the Vision Fund nonsense to 0, SoftBank is still a real company that does stuff outside of being a bad PE/VC/HF firm.
[0] https://www.reuters.com/article/us-softbank-group-alibaba/a-...