40,000 BTC, not 10,000 BTC. Massive regret.
The sources you mentioned are not authentic. Laszlo is not active in this forum anymore. So, it's not possible to get an answer from him. But he was interviewed many times. He never said he traded 40000 Bitcoins for eight pizzas. Don't conclude just from some fake resources. Most Twitter accounts try to say something new and get attention to increase their followers. I won't believe any of them without a proper source. However, all three Tweets you quoted from the same Twitter account. If they can refer to the post where Laszlo himself said that he bought eight pizzas and traded 40000 Bitcoins, I will believe that. Moreover, I will look for the Blockchain transaction as well.
Don't trust anyone. Verify!
Whenever you see someone saying something without a source, Ask them to provide a reference from where they get it. Laszlo was active in the forum till 2017. Don't you think he would share that if he had done those deals too?
If you read the pizza thread, he comes back at some point and shares the wallet he used to make multiple pizza deals. If I remember correctly 35,000 bitcoins left the wallet, which he stated were used for multiple deals here. He also posted two separate photos from two different deals, one shows papa johns pizza boxes, the other something different. I’m too lazy to dig it up now, but just look at his post history, I don’t think it’s buried too deep.