先贴规则链接：IOI2024 Contest Rules。

在章节 Quarantine 中：

In order to protect the confidentiality of the tasks, all direct and indirect contacts and communication between contestants and delegation leaders are prohibited between the moment where tasks for a competition day are presented to the members of the GA and the end of the competition on the following day. During this period the contestants are not allowed to communicate by any means, direct or indirect, with anyone who knows the tasks (except for the usual communication with the Scientific Committee during the contest).

加之 Cheating 一节相关描述如下：

contestants must not communicate with other people during the competition, other than the support staff, and/or Scientific/Technical Committee members;

所以是否表明做出的扣除 $50\%$ 分数的处罚不是针对携带电子设备进入考场一事而是针对可能存在的与领队联系一事。

此外，没有发现任何有关扣除 $50\%$ 分数的描述。