Absolutely wrong. In the UK the lesser charge and the more serious charge both derive from the same facts. So, if the accused may or may not be guilty of the more serious charge, they equally may or may not be guilty of the lesser charge.
For example, a defendant charged with GBH may plead guilty to ABH in order to get the GBH charge dropped. If they were in fact guilty of GBH they were definitely guilty of ABH. And even if they were not guilty of GBH they may still have been guilty of ABH.
You cannot plead guilty to a crime you definitely did not commit to get a more serious charge dropped. It doesn't work like that at all.
In any event, this has increasingly little to do with your argument that girls are being bullied into accepting plea bargains over alleged false rape claims when they are, in fact, innocent and are then being imprisoned by judges who ignore the agreed sentence because they like sending young girls to prison. As I have pointed out, that is definitely not true.