Is “Li Yuan was robbed by troops sent by Yuwen Shu before he raised an army.” true?

In the novel 'Romance of the Sui and Tang Dynasties', Chapter 5, it is fictionalized that Li Yuan was robbed by the Eastern Palace guards sent by Yuwen Shu before he raised an army: 'We are not robbers, but guards of the Eastern Palace, ordered by Lord Yuwen, because you have a grudge with the Eastern Palace, so we were sent to rob you.' In the official history 'Old Book of Tang: Annals of Gaozu', this event is not recorded, and it belongs to the novelist's embellishment.