Right, got a bit of time to give this a proper answer. I know you're not interested, you just want to defend the Tories and attack Labour, but other people reading the thread might be interested
Johnson suspended parliament during critical period of the Brexit debate. Where parliament was meant to be able to debate and discuss, and eventually vote on how the country would try to Brexit. Essentially by proroguing parliament, he took away the chance for our elected representatives to actually represent us.
It deepened mistrust in government, damaged faith in our political system, and increased polarisation.
The gilt rates now compared to Truss's time are similar but the causes are very different. They spiked during her tenure as the markets had lost faith in the UK's financial stability. Mostly due to the massive, unfunded tax cuts she announced. It was an abrupt panic driven surge.
The high rate of gilts now reflect broader international factors, BoE high interest rates, inflation, normal market expectations.
The big difference is that the movement in gilt rates now are steadier and more predictable.
A simple summary is Truss’s spike was a crisis of confidence, today’s yields are part of a controlled, expected environment.