It depends on where you start. Exercise and training follow a very basic dose/response relationship where the higher you start, the more you need to progress. If you are a couch potato, 7 minutes a day will give you a lot of progress... until it doesn't. For example my starting point would be training four times a week and squatting 500lbs, so it probably wouldn't do much for me.
I wouldn't replace my current exercise routine with it because it wouldn't be enough to even match the 2018 physical activity guidelines for Americans [1]:
* 150 to 300 minutes per week of moderate-intensity aerobic physical activity, OR;
* 75 to 150 minutes per week of vigorous-intensity aerobic physical activity, AND;
* Resistance training of moderate or greater intensity involving all major muscle groups on 2 or more days per week.
I wouldn't replace my current exercise routine with it because it wouldn't be enough to even match the 2018 physical activity guidelines for Americans [1]:
* 150 to 300 minutes per week of moderate-intensity aerobic physical activity, OR;
* 75 to 150 minutes per week of vigorous-intensity aerobic physical activity, AND;
* Resistance training of moderate or greater intensity involving all major muscle groups on 2 or more days per week.
[1]: https://health.gov/sites/default/files/2019-09/Physical_Acti...