As a small aside your answer is 'anyone who has ever taken out an interest only mortgage' so literally millions of people lol. It's the business model of most medium to large scale property investors (including myself).
You’ve obviously completely taken it out of context. The club aren’t suddenly gonna magic up £637m in 15 years time unless we get taken over by a sugar daddy. Interest only loans are only viable in very specific situations. And over 15 years would be very risky unless you can be certain of making a profit long term and clearly that wouldn’t apply to the stadium as it’s not gonna be sold unless part of a takeover.