Here's an overview of what really happened.
Over the years he's pumped in personal cash of circa £300m by way of loans. All interest free with no repayment terms. £90m of which went on the stadium and related infrastructure, plus the Lancing complex, and subsidising trading losses...
An interest free loan from a very wealthy owner and lifelong fan is a debt in name only. Periodically TB converts huge tranches of the loan into equity, meaning that he'll never the see the money returned, unless the club is sold for a big sum.
I agree that Howe is a very good coach of attacking football.
But the the club have backed him with big numbers spent on fees, a £150m squad cost, including:
Lerma (WC star) £25m
Ake £20m
The quality of players purchased undoubtedly helps any manager's cause.