MTL - As An Immortal, I Only Learn Forbidden Skills - Chapter 21 confusion

Ling Chen, the number one prodigy in the Martial World, lost all his cultivation and martial arts when his sect encountered a major disaster.On the brink of death, Ling Chen accidentally obtained the divine martial arts text, ‘’Ling Tian Sword Scripture‘’, and was able to repair his meridians.From then on, he began to understand the Sword Way, condense the Sword Heart, comprehend the Sword Intent, and ultimately became a Sword God of his generation!

Hello, 1983! I am back!

My relatives, my partners, my hometown, everything changes because of me…

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- Description from novelbuddy

Bai Aoxue, the best mercenary in the 21st century, is accidentally sent back to the Chengxi Dynasty in Great Continent due to an explosion in her mission, and trapped in the first daughter of Prime Minister. After her rebirth, she is set up by her father to marry the 5th prince Jun Yeyan who wears a mask all day long.
In the face of bloodthirsty enemies, discord between brothers, collusion among courtiers and invasion of enemy state, can Bai and Jun resolve the crises? What will happen to their political marriage? How will the fierce battle for the throne end?
With many twists and turns, the book brings you to experience palace revolution, love and hatred thousands of years ago.

- Description from Novelupdates

No system, pure time travel, relying on intelligence and knowledge to control the situation, do not enter if you do not like it.-----------------------The protagonist travels to the Republic of France and becomes a quasi-rich third generation in a family of agricultural tractors.Unfortunately, it is near Paris. The Germans will soon come here, and to preserve the family, France must be saved.Gallieni: “God, the enemy actually presented their flank to us!”Xia Fei: “This can't be true, could it be a trap?”Protagonist: “The food is ready, go ahead, do I need to feed it to your mouth?”German Army: “Is this a tractor factory? What are these steel monsters that are impervious to knives and guns?”