Technically

de jure

(based on formal (de jure) arguments, which however may be misleading)

eigentlich

(based on precise facts, which however may be contrary to common misbelief or to a traditional name)

fachlich

(having or using the skills or talent required for a certain job or profession)

genau genommen

(based on precise facts, which however may be contrary to common misbelief or to a traditional name)

nach dem Stand der Technik

(according to the current state of technology)

technisch

(having or using the skills or talent required for a certain job or profession)

technisch

(according to the current state of technology)