"A spec-sheet fantasy sold at a disposable price, where claimed power and battery physics conflict."
The '40,000Pa suction' is a theoretical peak measurement, likely taken directly at the motor inlet. Real-world cleaning force at the floor head will be substantially lower after losses from the wand, filter, and attachments.
This is for someone on a strict budget with a small apartment and primarily hard floors. The buyer must be willing to accept that performance will not match the advertised numbers and that the product's lifespan may be short.
Anyone with significant carpeting, pet hair, or a home larger than a small apartment should avoid this. The effective runtime at a useful power setting will likely be inadequate, and the build quality is a major unknown.