That is simply not true. The problem is most people don't do bodyweight exercises that are difficult enough.This is temporary. Treat this as a maintenance exercise. You aren't going to get stronger or more fit by working out at home. All we can do is mitigate our losses. This is the perfect opportunity to transition into a natural cut. Take some time off from the weights and take up outdoor activities such as running, hiking, or bike riding. Do some outdoor manual labor if you can.
Don't do normal pushups, start doing 1 arm pushups.
Don't do normal squats do pistol squats or Bulgarian split squats.
Make a homemade sandbag and do workouts with that.
Get a weighted vest and do workouts with that. I can promise you that more than anything else I have ever done climbing hills with a weighted vest has huge carryover effect in the bedroom. It is exhausting and you will be drenched with sweat. I have a 60 lb vest but only have it loaded at 45-50 lbs right now while doing this.
I found a steep hill near me and do 3 sets of 10 up and down the hill with a set of 15 squats, lunges or total body extensions at the top each time I go up(I alternate through those). My legs have grown in size quite a bit since doing this as my jeans are almost not fitting both in the legs or butt area...