It is this article wherein the titanium use is mentioned: https://www.milliyet.com.tr/ekonomi/temel-kotil-neyin-nasil-yapildigini-bilmemiz-gerekiyor-6389845
"Kotil, importing that the Turks innovation to make life style, "We want to overcome ourselves as a company in Turkey. TAI, you have to overcome yourself. We're doing the fifth generation fighter aircraft. 2023 to run the engine on 18 March. Coming as told by story. We are with innovation it .This plane has an engine bigger than two F16 engines. For this we use a lot of titanium. For this we need to press a titanium part of five meters by seven meters. A few countries in the world have this press but they do not press it to us. We will do it with a 3D printer, under vacuum. We didn't come up with a new invention. We are currently buying 3D printer titanium technology. What we have no chance to do is need innovation. Without innovation, we cannot go this way. " He spoke in the form."
Hmm ok, could be large forge of some kind. I don't think its sheet metal per se....but rather the forge work area size for large titanium billet...with the tolerances needed for some application (to make further CNC etc as little as possible - i.e economic and feasible and reliable etc).
He is right that doing it harder 3d print way needs RnD effort for it more than the conventional forge/CNC route.
We will need more information later on the progress to get more idea on this, these are just speculations from me.