I don't agree. There are 2 separate issues. The owner of the...

I don't agree. There are 2 separate issues. The owner of the stock may just be lending out the stock to earn a fee even though the shorter will borrow the stock and drive the share price down. The owner of the stock expects the price to rise in future (due for example to the expected announcements later of new contracts). If the shorter drives the price down significantly the owner of the stock may use that fall in the share price to buy more shares at a lower price if they still expect positive future announcements. The result is they can increase their holding at a lower price.

Funds trying to build large stakes can certainly use lending out to increase their holdings at lower cost. They do not necessarily short the stock themselves.They will however use a variety of strategies to cap share prices while they build stakes. They might sell some shares they own, or short themselves, rather than lend stock out for others to short.