Suggested edits:

• turn the opening sentence into a question, "Is cryonics pseudoscience ?"
• change "is nothing more than wishful thinking" into "could be nothing more", etc.
• change "If you don't believe that, you can read" into "This is the point of view argued in"
• strike "This makes me sad, because", so the sentence starts "To my naive eyes"

This way your hook is neutral enough to draw everyone in.

ETA: I would be careful with the £25/mo quote, until and unless you get a quote from Rudi Hoffman or elsewhere. At least mention that the pricing is one of those logistical issues you've promised to cover in further posts.