Absolutely not.
It is quite apparent that Corbyn and McDonnell do not understand how businesses work. Neither of them are able to grasp something as simple as the people who will ultimately be affected by an increase in businesses taxes will be the consumer - many of whom are the 'poor' they apparently want to protect. Businesses will not altruistically swallow a tax increase - they will pass it on.
If an increase in business tax turns a profitable company into an unprofitable one, a business owner may simply decide to call it a day - resulting in a loss of jobs, some of whom could be affected are the 'poor' they apparently want to protect.
The detrimental ramifications of Corbynomics are enormous.
I see some utilities are now off-shoring holding companies, and transferring the stock into them, for fear Labour will issue CPOs at less than market value.
https://www.theguardian.com/business/2019/nov/24/power-firms-move-ownership-offshore-to-protect-against-labour-renationalisation