Well, it is largely semantics. You could say the same about free agency needs which affected draft needs. In the end only the full picture matters (and nobody knows anything for 2-3 years anyway). But yeah, the Slay deal is another reason why they didn't trade up, presumably.
If you do consider all transactions related to this draft to be part of evaluating the draft, there's a whole lot else to include:
The Eagles traded their 2020 third-round pick (No. 85) and their 2020 fifth-round pick (No. 166) for Darius Slay.
The Eagles ultimately traded the fourth-round compensatory pick (No. 146) they received for letting Golden Tate leave in free agency for three 2020 selections and the Dallas Cowboys’ 2021 fifth-round pick.
_The Eagles traded Johnathan Cyprien and the 2020 seventh-round pick (No. 228) they originally received from the Tampa Bay Buccaneers in last year’s DeSean Jackson trade to the Atlanta Falcons in exchange for Duke Riley and the Falcons’ sixth-round pick (No. 190). _
The Eagles then traded down 20 spots in the sixth-round (No. 210) for veteran wide receiver Marquise Goodwin from the San Francisco 49ers.
The Eagles traded their 2020 sixth-round pick (No. 200) to the Chicago Bears in exchange for Jordan Howard last year. Howard walked in free agency, which will potentially allow Philly to recoup a sixth-round compensatory pick in the 2021 NFL Draft.