If you turn on LBC now there's caller after caller engineers, medics and healthcare professionals saying a) that they themselves / or know of expert British businesses offering ventilators and PPE who were never contacted back and b) saying it was impossible for Dyson to provide the ventilators in a short time period starting from scratch.
If you still believe Johnson ever does anything for the good of anyone other than himself then you are incredibly naive. This is a man who has betrayed and lied to friends, family, wives girlfriends and colleagues. Twice sacked for lying he gave £126k of public money to a woman who he had a 4 year affair with including in his own home while his wife was undergoing cancer treatment. The man is evidentially totally amoral and is motivated solely by him being king of the world, and as he told his own MPs, capitalist greed.
The Sunak rumour was perhaps mischievously suggested by someone on Newsnight, I can't recall who, and it is nothing other than speculation . However someone is leaking these texts, and it will be fascinating to find out who and why.