The phrase "assumed instead" is correct and usable in written English.
It can be used when indicating that one thing was taken for granted or accepted in place of another.
Example: "The committee assumed instead that the project would be completed by the end of the month."
Alternatives: "taken for granted" or "presumed in place of".
This commemorative role, however, was assumed instead by the Arc de Triomphe, and in 1816 the Madeleine was made a church by the restored Bourbon regime.
In the 15th century, however, humanists (among them Lorenzo Valla) assumed instead that the text had been corrupted by its compilers and that its pure form could be recovered through the application of philological methods.
In October - during a conference call for investment analysts hosted by Lewis, finance director Alan Stewart and then chairman Sir Richard Broadbent - Tesco revealed for the first time that it did not own 70% of its freeholds as previously assumed, instead stating that it controlled 53% of its space across the whole of the group.
If (c) is assumed instead of (a) the argument is almost identical to the one above.
Generalized aerosol size distribution functions are usually assumed instead of their explicitly resolved spectra.
If the existence of a strictly monotone and asymptotically convergent solution is assumed instead of (3.3), we obtain the following.
No one asked if Mr. Green wanted these interventions, assuming instead that to do otherwise was both unethical and illegal, and he was treated to death.
Second, much of the media have failed to seriously engage with Israel's moral and strategic dilemmas, assuming instead that Israel deliberately seeks civilian casualties.
The moral panic over "sexualisation" assumes instead that sex is only ever damaging to young women, and that having sex or behaving sexually must be resisted for as long as possible.
He doesn't believe that the outsider generation Vice is speaking to will adopt old-style party-based politics any time soon, but will assume instead a far more eclectic and scattershot range of anger and passion.
So you'd wonder what he did mean and assume instead, if you were not already familiar with the usage, that he must mean "crazy", because you understand the rest of what you've read.
