I think you are misreading the situation.
Here is what James Allen thinks:
"[These] decisions show that Williams is pointing forwards with confidence. This weekend they have announced a strategic tie up here in the Middle East with the Qatar Science and Technology Park, where Williams will establish a Williams Technology Centre.
Two F1 related R&D programmes will be carried out there; one into the flywheel energy regeneration system they have been working on for a couple of years now, the other developing a simulator for race and road use. Williams and QSTP will jointly fund the centre and with share commercial revenues. It underlines the assertion I’ve been making for some time that Williams is a team of the future."
http://www.jamesallenonf1.com/2009/1...ews-to-follow/
A team which is struggling to pay for its engines will not enter into a strategic alliance to build and fund a major R&D centre. It is quite clear to me that Williams chose Cosworth in preference to both, Toyota and Renault. Maybe they know something about the cossie that you and I don't?
JA also says:
"...as a new engine, the technical team at Cosworth are allowed to continue developing the engine until March 1 next year, which gives them a lot of time to improve the product. Existing F1 engines are frozen.
Although reliability is unproven and there is no track testing allowed, the team at Cosworth has been supplemented recently by many engineers returning from other engine programmes, such as Mercedes’ in Brixworth. "