Did he trick the young marshal into becoming sworn brothers and then go south to Huangpu Military Ac

Dr. Lin Qi, a science PhD, gets into trouble while skiing and his body is transported to the early 1924.
He stormed into a bandit's den at the start, and before he could even figure out what was going on, he was hit on the head by a heavy machine gun from the young marshal's men.
There is no system, no personal space, and no old man.
The only thing he had was a hundred years of advanced math and physics knowledge in his mind, as well as extremely strong mental fortitude.
Faced with a desperate situation, Lin Qi showed no fear. He opened with two sentences of fluent Boston English and accurately pointed out the metallurgical defects that caused the Fengtian Army's rifles to explode, instantly giving himself a perfect image of a "double PhD from MIT" and a "rich tycoon from Southeast Asia".
The young marshal was astonished by his extraordinary talent and immediately pulled Lin Qi aside to cut off a chicken's head and become sworn brothers.
Taking advantage of the opportunity, Lin Qi put forward the theory of great power competition, which made the young warlord's son excited and willingly took out 200,000 silver dollars to beg him to go to the Whampoa Military Academy in the south to be a high-level undercover agent.
With the young marshal's operating funds, Lin Qi turned around and stirred up trouble in Shanghai, using an industrial blueprint to subdue the Jiangzhe financial tycoons and swiftly subduing the three bigwigs.
While others went to Whampoa Military Academy to become students and secure a future, Lin Qi went there with his own investment and became the vice principal!
He taught future generals about infantry-artillery coordination and simulated armored blitzkrieg tactics, showing them that the strongest weapons were the chalk and blueprints in their hands, not guns.
Years later, the full-scale War of Resistance against Japan broke out.
The Japanese soldiers were horrified to discover that they were not facing poorly equipped soldiers, but a mechanized behemoth armed to the teeth by Lin Qi himself and possessing a strong heavy industrial base!