As far as I can tell it is a genuine attempt to run a business, not just frippary for TV. They have a website at http://chateaudelamottehusson.com/
Apparently they wanted an old fashioned lift which was more sympathetic to the building but could not fit one.
By all accounts Strawbridge is a WYSIWYG type of guy with no fear of getting on with the job.
His techniques might not be perfect but he has brought a crumbling building back into use - is that wrong?
EDIT: Just looking at the website I note that they claim to be fully booked for weddings for 2018 and are taking enquiries for 2019 - that does not look like a business which “lacks credibility as a genuine project” though not every business gets free advertising on TV to quite the same extent.