No. I don't buy it. You are asking me to believe that an accident or malfunction will NEVER occur (i.e., probability = 0) causing the hydrogen to leak in an environment containing air/oxygen (which makes an explosive mixture).

That compound failure mode (H + O_2 explosive mix upon structural failure/leak) doesn't exist with Helium. So, I respectfully disagree that the fears are outdated.

A survey of NASA's experience [1] is informative. From the linked article:

> Even small amounts of liquid hydrogen can be explosive when combined with air, and only a small amount of energy is required to ignite it. Both its explosiveness and the extremely low temperatures involved make handling it safely a challenge. It has taken a lot of experience, including the experience of dramatic failures, to teach us just how dangerous it is and how carefully we need to treat it.

[1]: https://www.nasa.gov/pdf/513855main_ASK_41s_explosive.pdf