Flu didn't kill 500 people last week (using USA numbers here).
For the 2019-2020 year, there was an estimated 20,000 deaths for an average of 384 per week.
For the 2018-2019 year, there was an estimated 28,000 deaths for an average of 538 per week.
For the 2017-2018 year, there was an estimated 52,000 deaths for an average of 1,000 per week.
So, yes, that is exactly how much the flu kills every week, on average. In a bad flu year, like the 2017-2018 year, the flu kills twice as many as that.