This statement is true to a certain extent, however there were some factors that were out of Lloyd George's hands. For example, Lloyd George was not to blame for the state of Britain's economy after the First World War as the war had left Britain with an enormous amount of debt, which Lloyd George was not to blame for. Furthermore, Lloyd George was in a difficult position as Prime Minister as he was in charge of a coalition was made up by a majority of Conservatives, meaning he was unable to enact meaningful reform that would benefit the working classes. Also, the Irish problem damaged his position, however this was a problem that was centuries old and had harmed many previous Prime Ministers and it would be unfair to blame this on him.
On the other hand, there were many things that led to Lloyd George's downfall that he was at fault for. Firstly, he lost popularity due to the fact that he broke many of the promises that he made in the Liberal manifesto for the 1918 election, such as the promise to build houses for the returning soldiers, which he was unable to fulfill due to lack of funds. Moreover, he alienated the working classes by ignoring the recommendations of the Sankey Commission which advised him to nationalise the mining industry. This led to mass striking and thus weakened his position further. Ultimately, his personality and the scandals that surrounded him were the final straw and when it became public knowledge that he had been selling peerages for money, the Conservatives withdrew their support for him which lost him his position as Prime Minister. In conclusion, it seems that despite the fact that many of the factors that led to his downfall were out of his hands, ultimately Lloyd George was at fault for his loss of power.