It means believing that a certain race is inferior, and politically it means keeping people off that race from having any power or getting any benefit from government. Using the government to oppress them has always been systemic racism.

> The meaning of racism has always been the same: systematic oppression on the basis of race

first of all- in my opinion, it's fine that language changes over time

i do think that in the past, and for many today, people unambiguously marked a difference between individual and systemic/institutional racism

https://en.wikipedia.org/wiki/Institutional_racism

> Institutional racism, also known as systemic racism, is a form of racism that is embedded in the laws and regulations of a society or an organization. It manifests as discrimination in areas such as criminal justice, employment, housing, health care, education, and political representation.[1]

> The term institutional racism was first coined in 1967 by Stokely Carmichael and Charles V. Hamilton in Black Power: The Politics of Liberation.[2] Carmichael and Hamilton wrote in 1967 that while individual racism is often identifiable because of its overt nature, institutional racism is less perceptible because of its "less overt, far more subtle" nature. Institutional racism "originates in the operation of established and respected forces in the society, and thus receives far less public condemnation than [individual racism]".[3]

The fact that Carmichael and Hamilton explicitly drew a difference between individual and institutional racism implies that not all racism is systemic, and not all racism is individual. it implies that there can exist one without the other

logically, this is... A and B are both letters in the english alphabet, but not all english letters are B, even though A and B are very, very often seen in the same words

i'm fine with people designing or changing the overall term to imply or exclude one or the other, but to say it's always been static and unchanging is incorrect