It's a very simple concept but can have psychological hurdle to overcome, given the simplicity of it and implications once internalised.
Analogy .. BoE has root admin access to the database of £. Government does not, has read only access.
If the spending is financed via taxation it can still cause inflation if it doesn't produce any real resources.
Taxation does create room for non-inflationary spending. That being said, if a government used QE to finance spending that was productive in real resource terms then it would not be inflationary.
[1]https://www.ons.gov.uk/economy/governmentpublicsectorandtaxe... [2] https://tradingeconomics.com/united-kingdom/government-debt-... [3] https://www.theguardian.com/business/2022/sep/04/now-britain...
Some media and politicians love to make a big deal about this, but they are either misinformed or disingenuous (or both).